Add correct flagging for tests

Legacy codepaths need to run with the NSSL flags disabled.

Fixes: 324852821
Test: atest SystemUITests
Flag: ACONFIG com.android.systemui.keyguard_shade_migration_nssl
DEVELOPMENT

Change-Id: I5c39e06a8bfbbf5cfcc311ace29339d8de04d9fa
4 files changed