Fix circular reference for redirects (reverts #204)

What thought as an simple precaution against a non-updated redirect (which might have been caused by the MW issue outlined in #212) 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.

See also [0].

[0] http://wikimedia.7.x6.nabble.com/MediaWiki-Job-queue-problem-tp5036690p5037600.html