fix(filters): Fix bugs in Pixelate and Blur filter

[asturur]

Description

in the last refactor i didn't notice the difference between delta and uDelta in the blur filter and the spelling of uBlocksize.

closes #9960

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Build Stats

file / KB (diff)	bundled	minified
fabric	912.885 (+0.001)	304.811 (+0.001)

[github-actions]

Coverage after merging test-filters into master will be

83.76%

Coverage Report

File	Stmts	Branches	Funcs	Lines	Uncovered Lines
index.node.ts	14.29%	100%	0%	25%	23, 26, 29, 41, 44, 47
src
ClassRegistry.ts	88.71%	53.85%	100%	97.73%	31, 52, 52
Collection.ts	71.39%	31.15%	45.16%	83.91%	130, 138, 153, 155–157, 159, 169–170, 180–181, 197, 215, 217, 219, 228, 243, 254, 263, 265, 270, 279, 281, 283, 286–287, 302, 304, 306, 309–310, 327–328, 328, 328–329, 333–334, 337–344, 346–348, 350, 75, 99
CommonMethods.ts	88.57%	64.29%	83.33%	96%	50, 52, 9
Intersection.ts	81.42%	41.30%	73.33%	96.14%	105, 132–133, 166, 184–190, 228, 228, 237, 239, 289–291, 297, 297, 78, 80
Observable.ts	71.20%	45.45%	31.25%	85.48%	136, 145, 148, 160, 162, 165, 167, 41, 43, 68–70, 72, 76, 78, 80, 82–85, 87–91
Point.ts	84.43%	61.22%	41.18%	92.38%	104, 117, 148, 157, 179, 197, 206, 216, 225, 236–239, 259, 284–285, 294–297, 317, 328, 341, 349, 359, 95
Shadow.ts	81.22%	13.04%	37.50%	90.19%	144, 144–145, 145–146, 148, 150–155, 164, 181, 181, 181, 181, 199, 199, 201–202, 202, 204, 211, 211, 228–235, 237, 237, 239–240
cache.ts	83.72%	45.45%	75%	90.14%	57, 59, 71–72, 74–77
config.ts	82.21%	20%	44.44%	94.03%	123, 131–132, 134–137, 139, 142–143, 147, 152, 152, 152, 152, 152, 152
constants.ts	100%	100%	100%	100%
src/LayoutManager
ActiveSelectionLayoutManager.ts	86.67%	76.92%	28.57%	100%
LayoutManager.ts	89%	65.06%	53.85%	99.29%	269, 333, 344
constants.ts	100%	100%	100%	100%
index.ts	48.57%	37.50%	80%	66.67%	1, 1, 1–2, 2, 2–3, 3, 3–4, 4, 4–5, 5, 5, 5–6
types.ts	100%	100%	100%	100%
src/LayoutManager/LayoutStrategies
ClipPathLayout.ts	69.23%	33.33%	100%	78.95%	39, 41–42, 42–44, 46–48, 57, 57–58, 58, 66–69
FitContentLayout.ts	100%	100%	100%	100%
FixedLayout.ts	85.71%	20%	100%	100%	23, 23
LayoutStrategy.ts	84.30%	48.15%	71.43%	96.55%	46, 52, 54, 72, 72, 74, 88
utils.ts	62.90%	7.14%	100%	78.72%	28–32, 34–35, 39, 39–44, 47, 47, 47
src/Pattern
Pattern.ts	54.39%	3.03%	10%	65.95%	105–107, 113, 113–114, 117, 117–119, 119, 119–122, 130, 130–132, 132, 132, 132, 132, 132–138, 140–141, 143, 150, 150, 150, 150, 153–160, 160, 160–164, 174–175, 175, 175, 175–176, 176, 176–182, 182, 182, 182–183, 183, 183–188, 190–199, 204–205, 207–209, 211, 33, 37
src/brushes
BaseBrush.ts	78.67%	8.33%	14.29%	88.55%	110, 114, 114–115, 122, 122, 122, 122, 124–125, 130, 135, 143, 146, 155, 155, 155, 155, 155–160, 99
CircleBrush.ts	52.10%	12.50%	12.50%	58.25%	100–108, 108–118, 122, 130–139, 55, 67, 69, 76, 76, 78–79, 79, 83, 85–86, 92–98
PatternBrush.ts	97.06%	87.50%	100%	100%	21
PencilBrush.ts	91.06%	82.35%	100%	93.81%	122–123, 152, 152–154, 176, 176, 276, 280, 285–286, 68–69, 84–85
SprayBrush.ts	0%	0%	0%	0%	107, 107, 107, 107, 107–108, 110–111, 118–119, 121, 123–127, 136, 140–141, 141, 148, 148, 148–151, 153–156, 160–161, 163, 165–168, 17, 171, 178–179, 18, 181, 183–184, 186, 193–194, 196–197, 20, 200, 200, 207, 207, 21, 211, 22, 22, 22–24, 28, 32, 39, 46, 53, 60, 67, 84–86, 94–96, 98–99
src/canvas
Canvas.ts	72.39%	29.79%	78.57%	84.40%	1004, 1008, 1012–1013, 1018, 1022, 1031–1032, 1047, 1049, 1056, 1058, 1063–1068, 1105, 1126, 1128, 1130, 1137, 1140, 117, 1203–1207, 1249, 1252, 1260, 1285–1290, 1314, 1317, 1334, 1377, 1379–1400, 1400–1404, 1404–1409, 1409–1414, 1418, 1420–1421, 1423–1425, 1429, 1431–1435, 1438–1443, 1446–1448, 1451, 1453, 1465, 1467, 1474, 1476–1487, 1489–1492, 1492, 1494, 1498–1499, 1502–1503, 1506–1508, 1511, 183, 318, 328, 353, 369, 388, 431, 443, 559–563, 566–567, 569, 579, 582–583, 585, 588–590, 602, 609–613, 615–620, 622–626, 659, 661, 668–672, 674–679, 681, 683–684, 686–689, 691–692, 703, 747, 783–786, 789, 791, 791, 794, 796, 798, 824, 830, 839–840, 844, 853, 870, 870, 886–887, 906, 932–933, 935–936, 938, 947–953, 956, 964–970, 972, 974, 995–996, 999
CanvasOptions.ts	100%	100%	100%	100%
SelectableCanvas.ts	83%	49.08%	80%	93.58%	1012, 1021, 1089–1093, 1139–1140, 1142–1143, 1145, 1172, 1174–1175, 1175, 1177, 1213, 1216, 1218, 1220, 1236,