Remove ABCDEFG comment

I assume it was so a dev could mark the spot where they needed to put in
the analogue toggle, and they found a unique yet easy to remember
sequence of characters to Ctrl+F as a marker.

desktop_version/src/Input.cpp

@@ -331,7 +331,6 @@ void menuactionpress()
             //change smoothing
             music.playef(11);
             game.fullScreenEffect_badSignal = !game.fullScreenEffect_badSignal;
-            //Hook the analogue thing in here: ABCDEFG
             graphics.screenbuffer->badSignalEffect= !graphics.screenbuffer->badSignalEffect;
             game.savestats();
             game.createmenu(Menu::graphicoptions);