Disable glanceable hub for bubble flicker tests

The device may enter glanceable hub automatically if its charging + idle, and this interferes with the test.

Bug: 394479936
Test: atest com.android.wm.shell.flicker.bubble.OpenActivityFromBubbleOnLocksreenTest
Flag: EXEMPT test

Change-Id: If3027f694a1f7ad4d97ff10ff5861dd979b894cd