Updated mediawiki/extensions
Project: mediawiki/extensions/MultimediaViewer  25c294d569efbc0bf52c3d369d0a31f3be2a278f

QA: update navigation test for rspec

This should be pretty straightforward

* use RSpec3 expect() syntax
* prefer string to regex as argument to match() when appropriate
* use Selenium $browser.back instead of inline javascript

Change-Id: I2e214752224397859a00f11bf9acc5bdc7685464