Fix the ability to save changes made to an image.

props markoheijnen.
fixes #26000.
Built from https://develop.svn.wordpress.org/trunk@26425


git-svn-id: http://core.svn.wordpress.org/trunk@26325 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/js/image-edit.js

@@ -182,7 +182,7 @@ var imageEdit = window.imageEdit = {
 					callback();
 				}
 
-				if ( $('#imgedit-history-' + postid).val() && $('#imgedit-undone-' + postid).val() === 0 ) {
+				if ( $('#imgedit-history-' + postid).val() && $('#imgedit-undone-' + postid).val() === '0' ) {
 					$('input.imgedit-submit-btn', '#imgedit-panel-' + postid).removeAttr('disabled');
 				} else {
 					$('input.imgedit-submit-btn', '#imgedit-panel-' + postid).prop('disabled', true);