Updated mediawiki/extensions
Project: mediawiki/extensions/BlueSpiceExtensions  91d24933f1462545886dcf938e452677ca83570a

Make it possible to remove categories in view mode

Categories could not be removed in view mode (just adding). Now, all
categories are removed before setting the selected.

Change-Id: I88e4cbe5e0c8db50d7388d14bedfd7ce215ad8b6