Updated mediawiki/extensions
Project: mediawiki/extensions/MultimediaViewer  f91280eac1e757db311c8f61d776b261c2c683b7

Add MS prefixed version of .unselectable

Apparently -ms-user-select is a thing now.

Change-Id: Ic059dc69b0b3ceeb089b4accdd09fa8c6b9061f2