Fixed a second false "Major Outage" reading on the status page

A follow-up to an earlier status page fix. The "Mentor profiles" row on our status page was showing a Major Outage, but mentor pages themselves were loading normally the whole time.

The cause was specific to the automated check itself, not the site: the background job that samples mentor data was hitting a network snag reaching our database directly, in a way that never affected real visitors browsing or requesting mentors. We've rebuilt that check to test the actual mentor directory page instead, which reflects what members really experience.