Updated mediawiki/extensions
Project: mediawiki/extensions/Flow  33134e50db554ae7bcd661074b1dc27a17842920

Ensure buttons are disabled by default for reply and create topic

Only enable them when textarea has content.
Add mw-ui-input-required class to inputs that are required fields for
a form.

Change-Id: I3f56a92eda6cad8244fca2343a334a4122314cca