Always update lockscreen UDFPS icon's progress

The progress determines the fade amount (since
it represents the transition to the AOD UDFPS icon),
so we want to make sure it's appropriately set so
isn't in a stale state.

Test: manual
Fixes: 229705284
Change-Id: I8ceb93a93c3614a3080787f43d6dcd7b86b1221a