Make the arguments of 'wp_audio_shortcode_override' and 'wp_video_shortcode_override' more consistent with the ones of 'img_caption_shortcode' and 'post_gallery' filters.

see #25313.

git-svn-id: https://develop.svn.wordpress.org/trunk@25485 602fd350-edb4-49c9-b593-d223f7449a82