Call StatusBar#finishKeyguardFadingAway after the fling animation.

This isn't currently isn't being called with the new keyguard unlock animation if bypassing the keyguard due to biometric unlock. This results in ScrimController#expansionAffectsAlpha remaining false after an unlock, which in turn results in a transparent shade scrim even when unlocked+expanded.

Filed b/186873982 to track a permanent fix (for a safer fix-forward, I am checking if the new unlock animation is running before calling #finishKeyguardFadingAway, but that's likely not necessary).

Bug: 186760125
Test: manual
Change-Id: I79a70034a02af45d69dc0e80554141c65f6b5ed8