Fix circular reference for redirects created by UpdateJob (reverts #204)

What thought as an simple precaution against a non-updated redirect (which
might have been caused by a MW issue outlined in #212) can create a circular reference.

- Create page `A` to `#REDIRECT [[B]]`
- Create page `B` to `#REDIRECT [[C]]`
- Create page `C` to `#REDIRECT [[A]]`

Above creation schema will create an infinite `UpdateJob` Queue.