Fix tv volume control icon color

The color of the volume control icon is currently set to
android:textColorPrimaryInverse, because of the color extraction
colors set in the device default theme.
This CL fixes the color of the icon for tv

Bug: 188391270
Test: m && flash && check manually that volume control works
Change-Id: Ib605c643001fc9e6c170abd937dd3559a6778a57