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

core/java/android/widget/RatingBar.java

@@ -110,8 +110,8 @@ public class RatingBar extends AbsSeekBar {
         }
 
         // A touch inside a star fill up to that fractional area (slightly more
-        // than 1 so boundaries round up).
-        mTouchProgressOffset = 1.1f;
+        // than 0.5 so boundaries round up).
+        mTouchProgressOffset = 0.6f;
     }
 
     public RatingBar(Context context, AttributeSet attrs) {