Text box size for audio file captions is too small

[PurpleStephyr]

Text box size is too small to view text properly when setting caption for audio file.

To reproduce:

1. Use another app to "share" an audio file with Tusky (I used ASR)
2. Edit caption on file.

Note that I don't see this issue when editing a post, although the text box still doesn't have a lot of vertical room.

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• Tusky Version: 23.0

• Android Version: 10

• Android Device: Samsung Galaxy S9

• Mastodon instance (if applicable):

• I searched or browsed the repo’s other issues to ensure this is not a duplicate.