ui: clear available camera streams after going offroad (#36441)

clear available camera streams after going offroad

selfdrive/ui/onroad/cameraview.py

@@ -114,6 +114,7 @@ class CameraView(Widget):
       # which drains the VisionIpcClient SubSocket for us. Re-connecting is not enough
       # and only clears internal buffers, not the message queue.
       self.frame = None
+      self.available_streams.clear()
       if self.client:
         del self.client
       self.client = VisionIpcClient(self._name, self._stream_type, conflate=True)