Really log calls to wfDebugLog()

https://wikia-inc.atlassian.net/browse/PLATFORM-424

@Wikia/platform-team 

Start logging calls to ``wfDebugLog()``
Right, it *may* return false, which indicates an error of some sort during hook execution which should cause the caller to react differently. I think this is using that mechanism in an unexpected way, and my main complaint is that if anyone looks at ```wfDebugLog```, they would expect the hook to complete successfully 99% of the time (unless something extreme happens), but the opposite is actually true - the hook will never be successful. This makes the code beneath that ```if``` statement dead code, and the code that ```wfDebugLog``` executes is actually in a completely different file for no reason.

I don't think we should worry about modifying core here - we've already made the decision as an organization that it's OK for us to modify core where it makes sense and we won't break anything major.