Dismiss a room's window when its flow finishes as there's no longer a reason for it to be alive.

ElementX/Sources/FlowCoordinators/RoomFlowCoordinator.swift

@@ -900,6 +900,7 @@ class RoomFlowCoordinator: FlowCoordinatorProtocol {
             // iPhone the compact module diffs call the dismissal callback and we present a blank space flow 🙈
             if spaceRoomListProxy == nil {
                 navigationStackCoordinator.setRootCoordinator(nil, animated: false)
+                flowParameters.windowManager.closeAuxiliaryWindow(forType: .room(roomID: roomProxy.id))
             }
         }