LORD: Fix crash when exiting aratime igm

This is a minor change to prevent the aratime IGM from crashing out of LORD when the player exits due to undefined return code from an inner function.

xtrn/lord/aratime/aratime.js

@@ -191,6 +191,7 @@ function chkmaint()
 		more_nomail();
 		exit(0);
 	}
+	return 0;
 }
 
 // TODO CONFIG