Fix the selected state of the mute icon is incorrect

After adding the second call, the color of mute button is updated
so that the selected color is removed, leading to mismatching with
its work state.

To fix it, before applying background color, un-select the button
and re-apply the saved selected state after background is changed.

Change-Id: Ic72308d4005857d54cfbc410d5bf67421f81eefa
CRs-Fixed: 2029912
1 file changed