Remove duplicated line (#344)

Author: jan-janssen

pylammpsmpi/wrapper/concurrent.py

@@ -394,7 +394,6 @@ def has_jpeg_support(self) -> Future:
             A future object representing whether the Lammps library has JPEG support.
         """
         return self._send_and_receive_dict(command="has_jpeg_support", data=[])
-        return self._send_and_receive_dict(command="has_jpeg_support", data=[])
 
     @property
     def has_ffmpeg_support(self):