Use cropped image size to determine if a wallpaper is situable for a display

Also, reduce the display to wallpaper size threshold from 1.5 to 1.3.

Bug: 384519749
Flag: android.app.enable_connected_displays_wallpaper
Test: atest FrameworksMockingServicesTests:WallpaperCropperTest
Change-Id: I4b433d01f13cf22ed456f6c35f299c14de57874c