Remove grphx.init() from Graphics::init()

grphx.init() is going to be called again (after grphx.destroy()) in
graphics.reloadresources() anyway, so there's no reason to have it here.

desktop_version/src/Graphics.cpp

@@ -15,8 +15,6 @@
 
 void Graphics::init()
 {
-    grphx.init();
-
     flipmode = false;
     setRect(tiles_rect, 0,0,8,8);
     setRect(sprites_rect, 0,0,32,32);