Use dark color for initial media control background

Media album art and solid colors will always be a darker color, to match
the rest of quick settings. This updates the default initial background
color to be the same as inactive QS tiles

Test: visual
Bug: 310741705
Flag: NONE

Change-Id: Ia58f3bf23a853bb5ef0def0b5dff23e2cf89c232
1 file changed