[flexiglass] Fixes bug where fingerprint text wouldn't show in bouncer

Fix: 357663638
Test: manually verified that the text shows up after the second time the
bouncer is shown following 3 and then 2 wrong fingerprints
Test: unit tests updated
Flag: com.android.systemui.scene_container

Change-Id: I2093c82730a0c0a495846fc50b50032c7472e0ee