Very minor changes for performance isolation

When shade blur is not enabled, bouncer blur should be ramped down to min blur radius when go back to expanded shade

The high blur radius was still being applied behind the shade when we leave the bouncer

Bug: 370555003
Test: no-op
Flag: com.android.systemui.bouncer_ui_revamp
Change-Id: I4ab596166fbc6fd7757ca8ee639b45c8fb53d2fa