draw9 accessibility: Remove jslider.setSnapToTicks

Setting a JSlider in snapToTicks breaks its keyboard controls.
This seems to be a longstanding JDK bug. This CL simply removes
that setting from draw9patch's zoom and patch scales in order to
better support keyboard navigation for accesibility.

Fixes https://code.google.com/p/android/issues/detail?id=69196

Change-Id: I72006b962c4b87985f3e1f44d17534fd7d81d241
1 file changed