Updated mediawiki/extensions
Project: mediawiki/extensions/Flow  cb14b6ab6a6150ec84d40200068105112b0020f1

QA: the check for the timestamp hasn't worked well, use other means

Checking for the absence of Cancel and Preview buttons instead of
the timestamp should make the check for proper saving less flaky

Change-Id: I7a672a45605895c4fe5f27f92516fdbc5e721b61