fix: Batch export edit form in new UI to have 1 destination selector

[tiina303]

Problem

In the new UI we had 2 batch export destination selection options

Changes

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Does this work well for both Cloud and self-hosted?

How did you test this code?

[posthog-bot]

📸 UI snapshots have been updated

2 snapshot changes in total. 0 added, 2 modified, 0 deleted:

• chromium: 0 added, 2 modified, 0 deleted (diff for shard 1)
• webkit: 0 added, 0 modified, 0 deleted

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[github-actions[bot]]

Size Change: 0 B

Total Size: 1.05 MB

ℹ️ View Unchanged

Filename	Size
frontend/dist/toolbar.js	1.05 MB

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[posthog-bot]

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