fix(card-browser): note editor fragment updated browser deck

[david-allison]

Fixes

• Fixes Browse (split screen): changing deck in note editor updates the browser instead #18462

Approach

Prefer the parent fragment over the activity when finding DeckSelectionListener

How Has This Been Tested?

API 34 tablet emulator

Learning (optional, can help others)

I have a more involved fix, but this was really easy after #18463 was merged

• refactor(card-browser): Convert to fragment (and fix a few issues) #18463

Checklist

• You have a descriptive commit message with a short title (first line, max 50 chars).
• You have commented your code, particularly in hard-to-understand areas
• You have performed a self-review of your own code
• UI changes: include screenshots of all affected screens (in particular showing any new or changed strings)
• UI Changes: You have tested your change using the Google Accessibility Scanner

[BrayanDSO]

Just by taking a glance, I get why it needs a more involved fix

[david-allison]

Nightmare of a class: we originally had a spinner, then moved to a dialog, but kept the 'spinner' functionality around.

The actual dialog isn't too bad