GridFieldBlogPostState: Added 'Modified' tag to timer state

and adjusted code spacing.

forms/gridfield/GridFieldBlogPostState.php

@@ -45,7 +45,7 @@ class GridFieldBlogPostState implements GridField_ColumnProvider {
 						"State for when a post is published.", array(
 							"date" => $record->dbObject("PublishDate")->Nice()
 						)
-					);
+					) . $modifiedLabel;
 				} else {
 					return _t(
 						"GridFieldBlogPostState.Published",