Fix returning to editor when game is faded-out

This would cause the editor to think that it itself is in the middle of
fading to the menu, and so then will fade to the menu, thus losing any
unsaved work without warning.

desktop_version/src/Input.cpp

@@ -1545,6 +1545,7 @@ void gameinput()
                 game.completestop = false;
                 game.state = 0;
                 graphics.showcutscenebars = false;
+                graphics.fademode = 0;
 
                 graphics.backgrounddrawn=false;
                 music.fadeout();