No longer awaken dream when showing global actions dialog.

The call to awaken from dream was needed when dreams lived in a floating
window. Now that they live in their own activity, they no longer float
above the global actions dialog and so killing the dream is not
necessary. Not killing the dream fixes issues with glanceable hub.

Bug: 351892094
Test: GlobalActionsDialogLiteTest
Flag: EXEMPT bugfix
Change-Id: Icf36e427efc64735a79914ea26e15f8eea9d6236