Add (if existing) games and last_game pgn file sync via dropbox at start

Make sure using most current pgn games and last_game files (in case multiple PicoChess systems  are used at the same time) for dropbox syncing

pgn.py

@@ -553,6 +553,10 @@ def _process_message(self, message):
             self.old_engine_elo = self.engine_elo
             if "engine_elo" in message.info:
                 self.engine_elo = message.info["engine_elo"]
+            try:
+                subprocess.run(['python3', '/home/pi/drupebox/drupebox.py'])
+            except FileNotFoundError:
+                pass
 
         elif isinstance(message, Message.LEVEL):
             self.level_text = message.level_text