retrogen.enableRetroGen is set to false but it still listens to the unload event.

The cause for this is legacy/old code which actually has no use anymore. Removing this piece of code for the next update.

Also, the chunk-version-controller isn't retrogen-code. It keeps track of the versions of all chunks so the retrogen if enabled can perform its necessary operations that it needs to instead of blindly populating all chunks with everything and creating dupes.