ipad: do not set video type attribute

Forcing it to video/mp4 does not make sense with HLS or audio. As this
was never needed on iOS, we just omit the type attribute instead of
implementing some unreliable detection mechanism based on filename
suffix.

js-plugins/ipad/flowplayer.ipad.js

@@ -925,7 +925,6 @@ $f.addPlugin("ipad", function(options) {
 				api.style.cursor = 'pointer';
 				api.style.webkitUserDrag = 'none';
 
-				api.type="video/mp4";
 			//	if ( hasBuiltinControls )
 			//		api.controls="controls";