[ticket/17390] Fix unset template variable for topic approval in mcp

Fixes a bug that was introduced in 558b8ae whereby a template
variable was added to wrap around the approve / disapprove UI
however that variable was not set in mcp_queue so the check
failed every time meaning you couldn't approve from the MCP.

PHPBB-17390

Author: danieltj27

phpBB/includes/mcp/mcp_queue.php

@@ -284,6 +284,7 @@ public function main($id, $mode)
 				$post_data = array(
 					'S_MCP_QUEUE'			=> true,
 					'U_APPROVE_ACTION'		=> append_sid("{$phpbb_root_path}mcp.$phpEx", "i=queue&p=$post_id"),
+					'S_CAN_APPROVE'			=> $auth->acl_get('m_approve', $post_info['forum_id']),
 					'S_CAN_DELETE_POST'		=> $auth->acl_get('m_delete', $post_info['forum_id']),
 					'S_CAN_VIEWIP'			=> $auth->acl_get('m_info', $post_info['forum_id']),
 					'S_POST_REPORTED'		=> $post_info['post_reported'],