Make sure to sleep(1) in the main RX thread

In case the consumer can't run, we need to sleep in the
main loop of the RX thread in case we are paused.

aprsd/threads/rx.py

@@ -70,6 +70,7 @@ class APRSDRXThread(APRSDThread):
             self._client.reset()
             time.sleep(5)
         # Continue to loop
+        time.sleep(1)
         return True
 
     def _process_packet(self, *args, **kwargs):