Updated mediawiki/extensions
Project: mediawiki/extensions/UploadWizard  6bee102b0004a163c8c84f8dfb956e31cb9917da

Enforce es3 compatibility for UW

Since we currently aim to support various ES3-only browsers, this is
especially important here.

Change-Id: I1fc0524084794cab25a71c86be507e29457492f0