Updated mediawiki/extensions
Project: mediawiki/extensions/Flow  419905422fa635205fa4c0c2c3274365f3b7ee3b

Repair subpage links going through redlink handling

Redlink handling was repointing subpage links to the root,
detect and fix.

Change-Id: I5c38d9f81fbf4c481156c6b547e09e5245bbef80