Update device entry fg icon to start with an empty state

We want the icon state to start with an empty state
so that on the start of a transtiion, we don't see an
animation to a start state. Rather, the start state
is static.

Test: manual
Fixes: 320500875
Flag: ACONFIG com.android.systemui.device_entry_udfps_refactor DEVELOPMENT
Change-Id: I50d282b3dd373774ebab6ee496bda0e980c9af15