fix(form): set fallback placement for type-select popover in array input

[bjoerge]

Description

Follow-up from #4963, which missed a fix for the popover that appears when adding an item to an array input that can hold several diferent types.

Before:

After:

What to review

• Make sure long lists of possible types are placed either above or below the "Add item…" button in array inputs

Notes for release

• Fixed placement of "Add item…" popover in array inputs

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
performance-studio	✅ Ready (Inspect)	Visit Preview		Oct 6, 2023 10:49am
test-studio	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Oct 6, 2023 10:49am

1 Ignored Deployment

Name	Status	Preview	Comments	Updated (UTC)
studio-workshop	⬜️ Ignored (Inspect)			Oct 6, 2023 10:49am

[github-actions]

No changes to documentation

[github-actions]

Component Testing Report Updated Oct 6, 2023 10:53 AM (UTC)

File	Status	Duration	Passed	Skipped	Failed
formBuilder/ArrayInput.spec.tsx	✅ Passed (Inspect)	5s	3	0	0
formBuilder/inputs/PortableText/Annotations.spec.tsx	✅ Passed (Inspect)	8s	3	0	0
formBuilder/inputs/PortableText/Decorators.spec.tsx	✅ Passed (Inspect)	9s	6	0	0
formBuilder/inputs/PortableText/Input.spec.tsx	✅ Passed (Inspect)	12s	9	0	0
formBuilder/inputs/PortableText/ObjectBlock.spec.tsx	✅ Passed (Inspect)	44s	18	0	0
formBuilder/inputs/PortableText/Styles.spec.tsx	✅ Passed (Inspect)	10s	6	0	0
formBuilder/inputs/PortableText/Toolbar.spec.tsx	✅ Passed (Inspect)	5s	3	0	0