Fix a few missing implicit void arg declarations

While working on #535, I noticed that editormenuactionpress() still
didn't do the explicit void declaration. Then I ran `rg 'void.*\(\)'`
and found three other functions that I somehow missed in #628. Whoops.
Well, now they no longer are missed.

desktop_version/src/Render.cpp

@@ -1166,7 +1166,7 @@ static void menurender(void)
     }
 }
 
-void titlerender()
+void titlerender(void)
 {
 
     ClearSurface(graphics.backBuffer);