Updated mediawiki/extensions
Project: mediawiki/extensions/Flow  2343b8bb602370ea036fab3a97fd5125e425e2e3

Remove invalid defaulted parameter

This was likely a `User $user = null` at some point which was
valid, but the User was stripped to allow UserProxy and now
the = null is just invalid.

Change-Id: I2106f822e22696eed41a855fc12553b69a1e0e5d