Updated mediawiki/extensions
Project: mediawiki/extensions/Flow  9e8f8388fa66c403c3a24a11cac40b43832bca2b

Cancelling topic reply preview results in missing form

The recent re-addition of mw.flow.editor caused an issue with missing
forms, essentially the preview needs to be undone before the editor
is destroyed.

Bug: 68591
Change-Id: I0490e1ac47a6e1e828d6293983015ba4756673ee