Set IA background not transparent

The static IA is overlapping the Wi-Fi slice when expanding Wi-Fi slice.
This is caused by that Wi-Fi slice is expanding quickly and static IA
is moving down slowly. We set the background of IA not to transparent
and make IA not overlap slice cards.

Fixes: 129491990
Test: visual
Change-Id: Ib28a18df0016c8fb58bd400085cb658f3bd9d3e6