Switch AuthDialogPanelInteractionDetector to isUserInteracting

Also deletes ShadeInteractor.isAnyExpanding, which was only used by
AuthDialogPanelInteractionDetector.

Fixes: 285111529
Test: Updated and ran existing tests
Test: Manual
Change-Id: Id3fc0bee4f08bf26545c3766743de0344ae98d69
4 files changed