Prevent dream from restarting when tapping timer controls

Live timer controls (play/pause) will trigger a trampoline activity.
This is causing the dream to get killed underneath the hub and restart.
This change avoids this by not waking from dreams every time an activity
is started, and instead letting the caller handle the dream wake.

Bug: 359384610
Test: atest WidgetInteractionHandlerTest
Flag: com.android.systemui.communal_hub
Change-Id: Iaa9e89a10eb30f8e5bd761b396f42c7dcd34518e