Revert "Use a different way to show the original filename"

This reverts commit d81a6c49e2.

Conflicts:
	js/download-original.js
	templates/post/fileinfo.html

inc/config.php

@@ -743,8 +743,6 @@
 	$config['show_ratio'] = false;
 	// Display the file's original filename.
 	$config['show_filename'] = true;
-	// Download the file with its original filename upon clicking on it. Only works when $config['show_filename'] is true.
-	$config['download_filename'] = false;
 
 	// Display image identification links for ImgOps, regex.info/exif, Google Images and iqdb.
 	$config['image_identification'] = false;