Retry face unlock without having to turn of the screen

[LuminarySage]

Right now the module attempts to do face unlock once and then just goes dormant until the user turns off the screen and then turns it back on. I think it would be nice to follow other major face unlock implementations like Google's and Apple's and:

1. Attempt face unlock at least twice without user's input

2. Attempt face unlock again when the user swipes up to go to the key guard

2.5. Maybe make every swipe up reattempts face unlock but limit it to about 5 times/swipes to prevent abuse