Re-add accent customization on Android 12 and above.
Previously, I disabled accent customization since I thought they were
more or less useless with the new Material You dynamic colors system.
Turns out I severely underestimated how horribly OEMs would botch the
dynamic colors system. Guess I was blinded by my adherence to the pixel
line. Re-add the accent customization for those who do not have a good
dynamic color palette at all.
Resolves#131.
e1e032d254