Updated mediawiki/extensions
Project: mediawiki/extensions/Flow  1869c50c55a170ef10beccc23f74ba8ce53de171

Fix small errors in board history page

* Fixed typo: getPostId-getHex() -> getPostId->getHex()
* Added isset( $needed[$id] ) check; may have already been unset for a previous entry.

Change-Id: Ic8349946736b27e6f2486e8ad4d1951d99e4c152