Remove temporary double icon workarounds

The root cause of the double restart icon problem has been now
fixed at native level so we remove all the temporal workarounds.
This reverts what's done in ag/22162524 and ag/21096323

Fixes: 280816887
Test: `atest WMShellUnitTests:CompatUIWindowManagerTest`

Change-Id: Ic6dc9c3a6cab523dd744cc806cc9ec68d01b9747