Revert "Fix inventory items blinking on item preloading"

The fix didn't work on some systems sadly this wasn't detected prior merge,
as preload is disabled by default now there's not gonna be a fix for it.

src/tile.cpp

@@ -894,7 +894,9 @@ video::ITexture* TextureSource::generateTextureFromMesh(
 			params.light_radius);
 
 	// Render scene
+	driver->beginScene(true, true, video::SColor(0,0,0,0));
 	smgr->drawAll();
+	driver->endScene();
 
 	// Drop scene manager
 	smgr->drop();