[ticket/13454] Remove unused variables

This is part 5 and there is more to come.

PHPBB3-13454

phpBB/includes/ucp/ucp_pm_compose.php

@@ -1052,7 +1052,6 @@ function compose_pm($id, $mode, $action, $user_folders = array())
 		}
 
 		// Now Build the address list
-		$plain_address_field = '';
 		foreach ($address_list as $type => $adr_ary)
 		{
 			foreach ($adr_ary as $id => $field)

phpBB/includes/ucp/ucp_pm_viewmessage.php

@@ -24,7 +24,7 @@ if (!defined('IN_PHPBB'))
 */
 function view_message($id, $mode, $folder_id, $msg_id, $folder, $message_row)
 {
-	global $user, $template, $auth, $db, $cache, $phpbb_container;
+	global $user, $template, $auth, $db, $phpbb_container;
 	global $phpbb_root_path, $request, $phpEx, $config, $phpbb_dispatcher;
 
 	$user->add_lang(array('viewtopic', 'memberlist'));