Remove outdated comment
Remove outdated comment

Preference was removed in 4c88b5973acdbef6ca3085d10647d2b486a330c8.

Change-Id: Ibaa277b5468eda29a0c6b11eeed9c9985ed15580

wikimedia/mediawiki-extensions-Thanks,wikimedia/mediawiki-extensions-Thanks,wikimedia/mediawiki-extensions-Thanks