Updated mediawiki/extensions
Project: mediawiki/extensions/Wikibase  e2843d90adbcef99779cb120d33d3f9c30892a52
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Making remove button state changeable

This is actually a remainder of when the remove button was independent from edit mode which made
the remove button's state (enabled/disabled) to not be affected by changing the overall toolbar
state. Since the remove button does show up in edit mode only, now, it should be treated just like
the other buttons.

Change-Id: I7a96f573e561d4bf53b852275c60b6115dc139e3