fix(sanity): fix controls for custom block components preview

[sjelfull]

Description

When a PTE object block has a custom components.preview, the dot-menu disappears. This fixes the check that adds the wrapper around the preview.

This is reproducible by adding a block to a PTE input with the following schema:

defineField({
  type: 'object',
  name: 'testPreview',
  fields: [
    {
      title: 'Title',
      name: 'title',
      type: 'string',
    },
  ],
  preview: {
    select: {
      title: 'title',
    },
  },
  components: {
    preview: () => <div>Yolo</div>,
  },
})

What to review

• That the UI looks correct when you have a custom components.preview for a block preview

Notes for release

• Fixed missing block action menu around custom block object previews

[vercel]

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Name	Status	Preview	Comments	Updated
test-studio	✅ Ready (Inspect)	Visit Preview	💬 Add your feedback	Oct 5, 2022 at 0:33AM (UTC)

1 Ignored Deployment

Name	Status	Preview	Comments	Updated
studio-workshop	⬜️ Ignored (Inspect)			Oct 5, 2022 at 0:33AM (UTC)

[stipsan]

LGTM 😄