Disable GlanceableHub blurred background in some tests.

This changelist updates the DisabledFlags annotation for tests
exercising conditions only true when blurred background is
not enabled.

Test: atest NotificationShadeDepthControllerTest
Bug: 389788272
Flag: com.android.systemui.glanceable_hub_blurred_background
Change-Id: Ie411d7a51fe589357fe1fb4e70ab1c7291bce832