No need to support pre-3.6 era saved searches anymore

This page wasn't really supporting them anyway, just saying, "Whoops,
that won't work, go fix it."
Remove very old overlay of the Bulk Update page

It was only overlayed to remove the "Comment" update type, but we handle
that more cleanly via JS these days.  Even if the UI does offer comment
when JS is off, the granted rights prevent them.