[Fix] Prevent mcmmo from modifing fish itemmeta

[LazyGon]

mcMMO fishing skill will modify fish caught. For example, add enchantment or change material type.
Stopped it by listenening mcmmo fishing skill event.

[LazyGon]

Servers with mcmmo must change mcmmo option config.yml > Skills.Fishing.Override_Vanilla_Treasures to be false.
If the option is true and caught item stack icon is not fish, caught item stack is changed to Salmon forcibly.

This infomation should be on wiki, I think.