chore: convert SharedDecksDownloadFragment to ViewBinding

[david-allison]

• Part of Add View Binding #11116

Approach

• Cherry picked david-allison@20cfeb4
• Updated to use vbpd

How Has This Been Tested?

Brief test:

Google Pixel 9 Pro

• ⚠️ [BUG] Shared Deck Download: 'Cancel' does not seem responsive #20077, but I don't think it's related

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