Allow keyguard capture when screenshare protections are disabled

Bug: 348335290
Test: atest MediaProjectionManagerServiceTest
Flag: android.companion.virtualdevice.flags.media_projection_keyguard_restrictions
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:894f27ffef61c65ed8da4843a6517a4a35088a4d)
Merged-In: I57ddb1c3d64c19ba346e44f4e1e4cbb328d3620e
Change-Id: I57ddb1c3d64c19ba346e44f4e1e4cbb328d3620e