bugfix: Do not render twice

The wp_twig_render-Function helps rendering templates.
For some old ob_* caching reasons it did this twice
which almost doubles the runtime
and would also call functions twice
possily changing the system state / database one time too often.
We reuse the already generated content from now on.

includes/functions.php

@@ -107,12 +107,7 @@ function wp_twig_render( Twig\TemplateWrapper $template, array $context = [] ):
 		}
 
 		// Cast to string as ob_get_clean could return false
-		return (string) $template->render(
-			array_merge(
-				$context,
-				wp_twig_context( $template->getSourceContext()->getName(), $template->getBlockNames() )
-			)
-		);
+		return (string) $content;
 	}
 }