Updated mediawiki/extensions
Project: mediawiki/extensions/Flow  5a494df3f9ca01d4ea569391ffdf4108ee7c5bab

Make wgFlowContentFormat = html the default

We aren't running or testing format 'wikitext' and so we have bug 70148
and probably others with it.  It seems better to make the default match
what works, instead of new Flow installations running straight into bugs
we aren't fixing.

Change-Id: I1d5d6bff4d1a24296e42c339436ecf161080fcff