Correct the priority for protected actions

The method adjustPriority doesn't adjust the priority for protected
actions on updated privileged apps after booting. The value should
be capped to '0' for all protected actions regardless of the update.

Bug: 65480939
Test: atest PrivilegedUpdateTests
Change-Id: Iee5f32561f3b3782e62502a228c3fa0b70326d3c