SDLPP: Don't save textures before render

Since textures should only be manipulated in the main thread (as well
as rendering), let programmers deal with ensuring the texture is
available during rendercopy

sdlpp/sdlpp_scene.cpp

@@ -120,10 +120,8 @@ void Scene::renderScene( bool clear_renderer ) {
     if ( background && background->getTexturePtr() )
         SDL_RenderCopy( renderer->getRendererPtr(), background->getTexturePtr(),
                         NULL, NULL );
-    for ( const auto &x : render_objects ) {
-        x->saveCurTexture();
+    for ( const auto &x : render_objects )
         x->render();
-    }
 }
 void Scene::presentScene() {
     SDL_RenderPresent( renderer->getRendererPtr() );