Pass the overflow state in the initial update

Flag: com.android.wm.shell.enable_optional_bubble_overflow
Flag: com.android.wm.shell.enable_bubble_bar
Test: manual - have the bubbles in the overflow when a bubble is
               added to bubble bar for the first time
Bug: 334175587
Change-Id: If0b4ff1261fadf60f52e59ee27fdfb61a77b48be