Adjust touch progress offset to account for changes to AbsSeekBar

Previously AbsSeekBar always rounded up, which resulted in poor handling
of touches near the edge of a progress value. We fixed this but forgot
to adjust RatingBar for the new behavior.

Bug: 30558586
Change-Id: I634fa7a0b98568093e16279ef5a80abe08d2e2fe
1 file changed