Updated mediawiki/extensions
Project: mediawiki/extensions/BlueSpiceExtensions  665670315fa5e98447b33acf900c6557fa36eca1

BS223: Flexiskin + UniversalExport

* changed default styling generated for new skin to match new bs skin
* page reloads when skin is selected
* fixed minor warning in universal export

Change-Id: I5f93dadfdf8a262a5f0273f72137ca913dda6ed3