chore(test-studio): fix custom markers PTE example

[christianhg]

Before this change, annotations would not be properly rendered in the editor. Instead of rendering the text element, the form for editing the annotation was rendered in the editor. This is clearly not intended and causes Slate to blow up when you try to focus the rendered form.

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Can be tested here:

Annotated text before:

Annotated text now:

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[github-actions]

No changes to documentation

[github-actions]

Component Testing Report Updated Aug 12, 2024 12:11 PM (UTC)

File	Status	Duration	Passed	Skipped	Failed
comments/CommentInput.spec.tsx	✅ Passed (Inspect)	42s	15	0	0
formBuilder/ArrayInput.spec.tsx	✅ Passed (Inspect)	8s	3	0	0
formBuilder/inputs/PortableText/Annotations.spec.tsx	✅ Passed (Inspect)	29s	6	0	0
formBuilder/inputs/PortableText/copyPaste/CopyPaste.spec.tsx	✅ Passed (Inspect)	37s	11	7	0
formBuilder/inputs/PortableText/copyPaste/CopyPasteFields.spec.tsx	✅ Passed (Inspect)	0s	0	12	0
formBuilder/inputs/PortableText/Decorators.spec.tsx	✅ Passed (Inspect)	18s	6	0	0
formBuilder/inputs/PortableText/DisableFocusAndUnset.spec.tsx	✅ Passed (Inspect)	10s	3	0	0
formBuilder/inputs/PortableText/DragAndDrop.spec.tsx	✅ Passed (Inspect)	3m 0s	0	0	0
formBuilder/inputs/PortableText/FocusTracking.spec.tsx	✅ Passed (Inspect)	44s	15	0	0
formBuilder/inputs/PortableText/Input.spec.tsx	✅ Passed (Inspect)	1m 46s	21	0	0
formBuilder/inputs/PortableText/ObjectBlock.spec.tsx	✅ Passed (Inspect)	1m 14s	18	0	0
formBuilder/inputs/PortableText/PresenceCursors.spec.tsx	✅ Passed (Inspect)	8s	3	9	0
formBuilder/inputs/PortableText/RangeDecoration.spec.tsx	✅ Passed (Inspect)	25s	9	0	0
formBuilder/inputs/PortableText/Styles.spec.tsx	✅ Passed (Inspect)	17s	6	0	0
formBuilder/inputs/PortableText/Toolbar.spec.tsx	❌ Failed (Inspect)	1m 23s	20	0	1
formBuilder/tree-editing/TreeEditing.spec.tsx	✅ Passed (Inspect)	1m 49s	30	0	0
formBuilder/tree-editing/TreeEditingNestedObjects.spec.tsx	✅ Passed (Inspect)	20s	3	0	0