Item12327: fix broken context code in earlyInitPlugin handler

When I introduced the SafeWikiSignable context a few commits ago, apparently I
accidentally committed an intermediate version that forgot to deliver a
sensible return value. That'll teach me to develop in two repositories in
parallel...


git-svn-id: http://svn.foswiki.org/trunk@16452 0b4bb1d4-4e5a-0410-9cc4-b2b747904278