camera annotation text is reset when program ends

Author: elsw

program.py

@@ -129,6 +129,7 @@ def run(self):
       logging.info("quit: " + str(re))
     finally:
       get_cam().video_stop() #if video is running, stop it
+      get_cam().set_text(' ')
       get_motion().stop()
       self._running = False