Don't animate bouncer changes when fading out Keyguard

This fixes a regression from I5f264b74cc258e8d7f608978edfb1faa5ead385c
where we moved updateStates around. Setting the bouncer to hide
causes another animated update in scrim controller, which will
abort the current scrim animation.

Test: Unlock phone from bouncer, make sure proper fading is
happening.
Test: Unlock phone with fingerprint.
Test: Wake-and-unlock phone with fingerprint
Test: go/wm-smoke
Test: Double tap notification, press back, make sure scrim
animations are being played.
Change-Id: Iec0ec3f4a5f861a8ece2d2f8edc159653efafdca
Fixes: 63107737