Remove the svg file from the mask-border

[Issue] N/A
[Problem] Radius effect is applied redundantly
[Solution] Remove mask-border among duplicated effects

Signed-off-by: Hunseop Jeong <hs85.jeong@samsung.com>

src/css/profile/mobile/common/core.less

@@ -134,8 +134,6 @@
 	overflow-y: visible;
 	overflow-x: hidden;
 	flex-shrink: 1;
-	mask-border: url(images/0_Round_corner/round.svg) 77;
-	mask-border-width: 26 * @px_base;
 	border-radius: 26 * @px_base;
 
 	&.ui-content-padding {
@@ -151,8 +149,6 @@
 
 	.ui-content-area {
 		background-color: var(--background-area-color);
-		mask-border: url(images/0_Round_corner/round.svg) 77;
-		mask-border-width: 26 * @px_base;
 		border-radius: 26 * @px_base;
 		box-sizing: border-box;
 		box-shadow: 0 0 0 0.25 * @px_base var(--content-area-line-color) inset;