fix(core): put back select button for single-asset source

[ricokahler]

Description

Seems like there was a regression in #6930 where the Select/Browse button would not render if there was only a single asset source.

What to review

Does the button show up now for a single asset source?

Testing

I removed the custom asset source so that there would only be one in the test studio, observed the bug, then fixed it.

Notes for release

Fixes a regression that caused the Select button to not appear.

[vercel]

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[github-actions]

No changes to documentation

[github-actions]

Component Testing Report Updated Jun 26, 2024 8:37 PM (UTC)

File	Status	Duration	Passed	Skipped	Failed
comments/CommentInput.spec.tsx	✅ Passed (Inspect)	39s	15	0	0
formBuilder/ArrayInput.spec.tsx	✅ Passed (Inspect)	7s	3	0	0
formBuilder/inputs/PortableText/Annotations.spec.tsx	✅ Passed (Inspect)	29s	6	0	0
formBuilder/inputs/PortableText/copyPaste/CopyPaste.spec.tsx	✅ Passed (Inspect)	34s	11	7	0
formBuilder/inputs/PortableText/Decorators.spec.tsx	✅ Passed (Inspect)	16s	6	0	0
formBuilder/inputs/PortableText/DisableFocusAndUnset.spec.tsx	✅ Passed (Inspect)	9s	3	0	0
formBuilder/inputs/PortableText/DragAndDrop.spec.tsx	✅ Passed (Inspect)	59s	0	0	0
formBuilder/inputs/PortableText/FocusTracking.spec.tsx	✅ Passed (Inspect)	39s	15	0	0
formBuilder/inputs/PortableText/Input.spec.tsx	✅ Passed (Inspect)	1m 21s	20	0	0
formBuilder/inputs/PortableText/ObjectBlock.spec.tsx	✅ Passed (Inspect)	1m 9s	18	0	0
formBuilder/inputs/PortableText/PresenceCursors.spec.tsx	✅ Passed (Inspect)	8s	3	9	0
formBuilder/inputs/PortableText/RangeDecoration.spec.tsx	✅ Passed (Inspect)	23s	9	0	0
formBuilder/inputs/PortableText/Styles.spec.tsx	✅ Passed (Inspect)	16s	6	0	0
formBuilder/inputs/PortableText/Toolbar.spec.tsx	✅ Passed (Inspect)	1m 11s	21	0	0
formBuilder/tree-editing/TreeEditing.spec.tsx	✅ Passed (Inspect)	56s	18	0	0

[binoy14]

Tested it manually and looks good, would be nice to have some sort of unit/component test for this. I see there is a unit test file for ImageInput but it's skipped/commented so probably not as simple to test I am assuming