Remove ability to look up spam

To stop assholes lagging the bot -

<justFen> .ud s p a m
<fenBot> justFen: Definition; spam spam spam spam spam spam spam spam
spam spam spam spam spam spam spam spam spam spam spam spam spam spam
spam spam spam spam spam spam spam spam spam spam spam spam spam spam
spam spam spam spam spam spam spam spam spam spam spam spam spam spam
spam spam spam spam spam spam spam spam spam spam spam spam spam spam
spam spam spam spam spam spam spam spam spam spam spam spam spam spam
spam spam spam spam spam spam spam spam spam spam spam