Fix volume slider color is not correct

Fixes: 140990940
Test: 1. Switch to dark theme
      2. adb shell am start -a android.settings.panel.action.VOLUME
      3. check volume slider color is identical to color in "Done"
      4. Switch to light theme
      5. adb shell am start -a android.settings.panel.action.VOLUME
      6. Check volume slider color is identical to color in "Done"

Change-Id: If783d5c5f8604a23cfaaa28cf42b916763f9c9e8