Step 8.4.1: Use `RoomViewStore` in SGWidgetDriver over `ActiveRoomObserver`
Step 8.4.1: Use `RoomViewStore` in SGWidgetDriver over `ActiveRoomObserver`

It wasn't using the listener functionality anyways, so just go straight to the source for which room is being viewed.

matrix-org/matrix-react-sdk,matrix-org/matrix-react-sdk,matrix-org/matrix-react-sdk,matrix-org/matrix-react-sdk,matrix-org/matrix-react-sdk,matrix-org/matrix-react-sdk