Revert r44798 "short-circuit update call"

Revert r44798 "short-circuit update call"
Article::viewUpdates() may do things other than update counters (for instance, it updates the user-talk and watchlist for last-viewed status, and might do other things in the future). Let it centralize its own checks for what things are enabled. Since you won't necessarily know them all over in Wiki.png, they may get out of sync and lead to bugs if you try to replicate the check.