Always rebind user-set wallpapers

setWallpaperDescription is only called from WallpaperManager APIs
directly. In this case, always rebind the wallpaper, even if the same
component is already set.

We keep the forceRebind internally for specific cases (for example,
after a clear(FLAG_LOCK), we want to move the HOME wallpaper to
HOME+LOCK, we do it via setWallpaperDescriptionInternal(force=false).

The COMMAND_REAPPLY will no longer be sent and should probably be
removed.

Test: atest WallpaperManagerTest
Flag: EXEMPT small change
Bug: 417165168
Want-Code-Review: all

Change-Id: I296b3e2d029e89eecdc5bf03d11715a750be741b