fix(patchers): fix importing images and sounds using @nextcloud/router

[ShGKme]

☑️ Resolves

• Issue: Video background image round one  spreed#9276 (comment)

🖼️ Screenshots

No visual changes in the current version

🚧 Tasks

Previously all the files were requested from the server, except sounds - they were imported as a local file from a copy. This is a problem because:

• Talk images should also be imported from the local files, not requested

• Talk sounds should not be copied to this repo - we can require them from the spreed repo during the build. Only the notifications app's sounds could be copied.

• Update generateFilePath patch from @nextcloud/router:

  • Always require images and sounds for 'spreed' app from the spreed repository
  • Require sounds only for the 'notifications' app from the local copy
  • Remove unused copy of the spreed's sounds

• Patch imagePath from @nextcloud/router to use patched generateFilePath

[Antreesy]

Tested at mentioned PR.
Works properly!

[Antreesy]

Tested, still works!

[ShGKme]

Rebased onto main and rebase --autosquash, no changes