Set audio player to width: 100% and avoid breaking the layout in iOS when we fall back to a link.

props markjaquith, davidjlaietta.
fixes #24896.



git-svn-id: http://core.svn.wordpress.org/trunk@24948 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/media.php

@@ -910,6 +910,7 @@ function wp_audio_shortcode( $attr ) {
 		'loop'     => $loop,
 		'autoplay' => $autoplay,
 		'preload'  => $preload,
+		'style'    => 'width: 100%',
 	);
 
 	// These ones should just be omitted altogether if they are blank