phpcs jobs fetch Zuul ref over git protocol

I previously forgot to override the git-zuul macro being used there.

Jobs updated:

mediawiki-core-phpcs-HEAD
mediawiki-core-phpcs-lenient
mediawiki-core-phpcs-lenient-HEAD
mediawiki-core-phpcs-strict
mediawiki-core-phpcs-strict-HEAD
mediawiki-core-regression-phpcs
mediawiki-core-regression-phpcs-HEAD
mwext-Translate-phpcs-lenient
mwext-Translate-phpcs-lenient-HEAD
mwext-Translate-phpcs-strict
mwext-Translate-phpcs-strict-HEAD

Change-Id: I59e31f8c822121bf4b0ff61a59e8ba34597af29f