Fix error color states and alphas and sizes of lock screen icons

Use "wallpaperTextColor" for the main colors and "colorError" for the
error colors. Remove the tint override in
keyguard_bottom_area that messes with the intended drawables' colors.

When fixing the size of the transition back to the lock (trusted state),
I had to also make the error icon smaller. So this may need new anim
assets to fix that.

Test: visual
Bug: 63991143
Change-Id: I6212a7ac532134c8fdc48889630c7d10cfab6b85