Offset preview to start if on wallpaper display

For static wallpaper preview, offset the preview to the start of the
wallpaper if the current display is the largest display(wallpaper
display) on multi-display devices. Other wallpaper remains the same.

Test: set multiple wallpapers w/wo fullscreen preview
Bug: 259745033
Change-Id: I34b593e706f2d60d7f213f229bc525214bdcca0d