TinyMCE: Restore old wordpress_adv_hidden editor parameter to enable force-showing the kitchen sink.

Merges [28181] to the 3.9 branch.

props azaozz.
fixes #27963.

Built from https://develop.svn.wordpress.org/branches/3.9@28226


git-svn-id: http://core.svn.wordpress.org/branches/3.9@28054 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/js/tinymce/plugins/wordpress/plugin.js

@@ -63,7 +63,7 @@ tinymce.PluginManager.add( 'wordpress', function( editor ) {
 
 	// Hide the toolbars after loading
 	editor.on( 'PostRender', function() {
-		if ( getUserSetting('hidetb', '0') === '0' ) {
+		if ( editor.getParam( 'wordpress_adv_hidden', true ) && getUserSetting( 'hidetb', '0' ) === '0' ) {
 			toggleToolbars( 'hide' );
 		}
 	});