Revert opacity changes from (Id94a5684b2c55956b01aa6cfb240784e6bab2f6e)

The change made to the status bar icon dual tone background color was
causing failures in CTS. Reverting that to fix the issue.

Test:  runtest -x
cts/tests/tests/systemui/src/android/systemui/cts/LightBarTests.java
Fixes: 64256444

Change-Id: I66979bef3369d85f51aac0e6705d21d038b57727