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.
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git-svn-id: http://core.svn.wordpress.org/trunk@25406 1a063a9b-81f0-0310-95a4-ce76da25c4cd