Fixed string in warning

cooperative_cuisine/pygame_2d_vis/gui.py

@@ -2038,7 +2038,7 @@ class PyGameGUI:
                             if key_set.joystick == event.instance_id:
                                 key_set.joystick = None
                         log.debug(f"Joystick {event.instance_id} disconnected")
-                        log.debug("Number of joysticks:", pygame.joystick.get_count())
+                        log.debug(f"Number of joysticks:"+str(pygame.joystick.get_count()))
 
                     # Press enter key or controller start button instead of mouse button press
                     if (