fixing: Remote Control Server does not terminate when PyRadio is closed

with Alt-F4 or using the close button

Author: s-n-g

pyradio/radio.py

@@ -10079,6 +10079,10 @@ def _linux_signal_handler(self, a_signal, a_frame):
                 )
             except:
                 pass
+        while self._remote_control_server is not None:
+            ret, _ = self._remote_control_server.close_server()
+            if ret:
+                self._remote_control_server = None
 
     def _windows_signal_handler(self, event):
         ''' windows signal handler