Updated mediawiki/extensions
Project: mediawiki/extensions/Flow  82593bf2b76e4bfde28a403d40f258307ed12ded

Fix fatal: Cannot access protected property RootPostLoader::$treeRepo

I made this var protected in a previous patch, but missed one occurence where it
was still called.

Change-Id: I6b5e7ac0aa920cde2987d02f543e94a795c220a5