Fix request #5586 - Search no longer available in mediawiki

Identify that we are in mediawiki for search based on URL pattern matching

Change-Id: I1d6dda7c09aed3d904b836462fb51e4d869be5d8
Merge commit 'refs/changes/39/1439/1' of ssh://gerrit.tuleap.net:29418/tuleap into HEAD

* ssh://gerrit.tuleap.net:29418/tuleap:
  Fix request #5586 - Search no longer available in mediawiki

Change-Id: I425314f504c31d73b83c8ca58a5b1893389eea47
This is Tuleap 6.7.99.3

Change-Id: Ie87857478cba31be13343ec0bcdc9d9182180016