[tp] Fixes wallpaper quick switcher preview flashing (2/3)

- Repository changed to filter out unknown wallpaper IDs.
- View binder updated to only animate thumbnails, borders, and selection
  icons, at the right times

Fix: 281004766
Test: manually verified that the flashing is gone. Done so for initial
app load, switching wallpapers through the switcher, and switching to a
new wallpaper that wasn't present in the quick switcher. Please see
before/after videos attached to the bug.

Change-Id: I9f414181667b51a1eb30cbad4812e3f84b7fbe34