corrects console typo for unregister system warning

ecsyjs / ecsy

Entity Component System for javascript

https://ecsyjs.github.io/ecsy/

MIT License

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Closed jdukleth closed 2 years ago

jdukleth commented 3 years ago

The console warning for being unable to register a system due to it not being registered has an illogical typo in it. This corrects that.