Updated mediawiki/extensions
Project: mediawiki/extensions/UploadWizard  525950bdd3e9960db3cca8408c061977aead0a71

UploadWizard: Use promises instead of plain callbacks

`mw.api.get` returns a promise that should be used instead of supplying
callback functions, which has been deprecated and clutters the console
while attempting to find more serious issues.

Change-Id: If6fe094a03217732beb246b55673dd5e135d5b35