Steam Deck Client Beta Update: Just a couple of things

Note: This update is for the Steam Deck Beta and Preview channels, and includes new features that are still being tested. You can opt into this in Settings > System > Steam Update Channel.

• Changed the boot video override folder to ~/.steam/root/config/uioverrides/movies/
  
  • Sorry to change this directory again
    
  • You'll need to create this folder yourself before adding videos
    
  • Same as last time: webm file format, no need to truncate, no need to mess with css
    
• Fixed a crash when Steam fails to find libwayland