Fix user config titles

[rossjrw]

There's a bug in user config creation where if the username has a space in it, the title of the resulting user page will be the text of their username up until the space.

This is a limitation of Wikidot's link syntax so I don't think I can do anything about it.

Instead I should correct these broken titles as part of the cleanup task.

I want to allow users to have any title they want. I only want to correct this one specific break, so the cleanup rule should be very permissive.