Blockland by default will add that to the start a game screen if RTB exists in your add-ons folder.
Glass creates an empty RTB so that add-on prefs will work, because Ephi insisted on a non future-proofed method of registering prefs.
You're going to have to live with it, unless Badspot clears out the code for handling RTB. (making sure it always executes first, and the "Use RTB" button on the menu.)