update login_chat.php

git-svn-id: https://plugins.svn.wordpress.org/wordpress-chat-plugin-by-123-flash-chat/trunk@942019 b8457f37-d9ea-0310-8a92-e5e31aec5664
update login_chat.php

git-svn-id: https://plugins.svn.wordpress.org/wordpress-chat-plugin-by-123-flash-chat/trunk@942020 b8457f37-d9ea-0310-8a92-e5e31aec5664