Update bot.js PUSH #14.1

Some minor updates:

- var nick removed b/c it's not used
- whitespace deletion
- mseg set to text by default
- data.nick variable setting simplified
- "spamFilters()" function needed only once (using CLIENT.on and detecting the robot's nick)

I did this update at school I won't be home for a few hours. Overall the lines of code was reduced.