Title.module uses old filter#short-tip

Since 2004-08-10, the filter module (CVS revision 1.21) moved the filter tips from hook_help() (with filter#short-tip and filter#long-tip) to hook_filter_tips(). Many contributed modules still use filter#{short|long}-tip. This results in filter tips not showing up.

This patch fixes this issue for filter.module.
The current CVS version displays some tips in its settings. I moved this to hook_filter_tips() since tips are meant for content contributers, not for site admins.