The MCE view for galleries needs to read `wp.media.galleryDefaults.columns` after [28990].

See #28693.

Built from https://develop.svn.wordpress.org/trunk@28991


git-svn-id: http://core.svn.wordpress.org/trunk@28779 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/js/mce-view.js

@@ -377,7 +377,7 @@ window.wp = window.wp || {};
 
 				options = {
 					attachments: attachments,
-					columns: attrs.columns ? parseInt( attrs.columns, 10 ) : 3
+					columns: attrs.columns ? parseInt( attrs.columns, 10 ) : wp.media.galleryDefaults.columns
 				};
 
 				return this.template( options );