Updated mediawiki/extensions
Project: mediawiki/extensions/Wikibase  b607ca83243ee30895b541c3213659c3abfd3b10
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(bug 44538) add/removeListItem functions for wb.listview plus related events

* Introduces 'addlistitem', 'listitemadded', 'removelistitem' and 'listitemremoved' events to
  jQuery.wikibase.listview
* listview.enterNewListItem() will now use the new functions and therefore trigger above events
* Comes with a fix in the referenceview where .value() would in some situations return a wb.Claim
  instead of a wb.Reference item.

- patch set 2: spelling errors

Change-Id: I48b0647fa3972059ff27bf4f222613cf5f3bb17f