Fix keyguard y translation while swiping

The swipe up signal comes from legacy shade expansion,
which can be unreliable. It will emit values of 0f and 1f,
at certain times as it resets, which can cause confusion
in the code and result in janky transitions.

Test: atest KeyguardInteractorTest
Fixes: 330189292
Flag: ACONFIG com.android.systemui.migrate_clocks_to_blueprint
TEAMFOOD

Change-Id: If9611004ee4692a21988466a3aa2558f904ade1f