test_onroad: ignore first few ui timing frames (#36385)

clean up

selfdrive/ui/onroad/cameraview.py

@@ -68,6 +68,7 @@ else:
 class CameraView(Widget):
   def __init__(self, name: str, stream_type: VisionStreamType):
     super().__init__()
+    # TODO: implement a receiver and connect thread
     self._name = name
     # Primary stream
     self.client = VisionIpcClient(name, stream_type, conflate=True)