Updated mediawiki/extensions
Project: mediawiki/extensions/Wikibase  5b967da3fa12a9b6a1992bf92007f80f55fbf648
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(minor) always start selenium tests in fullscreen

- otherwise it could happen that some elements (e.g. notifications)
are covering other elements

Change-Id: Ied2217f22cd5f8c691924aa7fbcf4cdc80ee6118