Set SECURE_FRP_MODE for backward compatibility on deactivation

Let's try to keep the mode in sync as a best effort. We expect to
replace all existing SECURE_FRP_MODE check with the new API later.

Bug: 290312729
Test: manually deactivate and see the setting change via adb shell
Change-Id: I20c6210532b6c775bc43447114448ef29e87c839