Updated mediawiki/extensions
Project: mediawiki/extensions/Wikibase  b305a7836d0d9e265ab94051d6ba149b1e2034d3

(bug 47435) Fix problem with dismissing copyright notice

Improvement of I010f7086fec45814c2715667f2d2056fdfd926b0 which lead to the copyright notice not to
be shown anymore. Instead of using a simple clone, we now clone data and events as well.

Change-Id: I8d2517568b394f9da8e2ad753e5c8d9fe9595a45