Generating correct URLs on Wikia Metrics page

All methods, which related to getting of url from object ``` F::app()->wg->title  ``` - returns urls, which contains additional params as a part of url path (e.g. ``` /wiki/Special:NewWikisGraph/pl ```)
And when we create instance of Title object in the following way ``` 

SpecialPageFactory::getPage( self::NEW_WIKIS_GRAPH )->getTitle() ``` - we are able to get url, without params (e.g. ``` /wiki/Special:NewWikisGraph ```)

So, this fix helps to solve issue with uncorrectly generated urls.