Only draw fading-in and fading-out animations in MAPMODE

This makes it so if you bring up the quit screen during a faded-out
screen, you will at least see the screen and won't see black. And also
the fade-in and fade-out animations will still work on the quit screen.
And more importantly, I tested and there's no 1-frame flicker or
anything.

desktop_version/src/Render.cpp

@@ -2460,7 +2460,10 @@ void maprender()
 
 
 
-    graphics.drawfade();
+    if (graphics.fademode == 3 || graphics.fademode == 5)
+    {
+        graphics.drawfade();
+    }
 
     if (graphics.resumegamemode)
     {