Change the bitmap transformation strategy when a 1:1 aspect ratio is
enabled to not stretch the bitmap but rather crop it.

On Android 11/12, the way the whole thumbnail was used for the
notification icon was not ideal, however the setting to toggle a 1:1
(as it states in settings) resulted in distortions.

Fix this by simply cropping the bitmap.

Update the 1:1 mode strings to remove mentions of scaling or
distortions, as those no longer apply.