Define a primary column for `WP_Post_Comments_List_Table`.

props boonebgorges.
see #25408.

Built from https://develop.svn.wordpress.org/trunk@32651


git-svn-id: http://core.svn.wordpress.org/trunk@32621 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/includes/class-wp-comments-list-table.php

@@ -699,6 +699,7 @@ class WP_Post_Comments_List_Table extends WP_Comments_List_Table {
 			),
 			array(),
 			array(),
+			'comment',
 		);
 	}
 

wp-includes/version.php

@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.3-alpha-32650';
+$wp_version = '4.3-alpha-32651';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.