Update title texts for the lockscreen show viewed toggle

Update the title texts for the lockscreen show viewed
toggles to have two types of titles dynamically adapt to
the status of compact/full list views.

Fix: 415107559
Test: manual in the Settings App
Flag: com.android.server.notification.notification_lock_screen_settings
Change-Id: I19d70f32fdc2cf48930844eb1a366683ad10bce5