Fix lib/copydir.js
Fix lib/copydir.js

 - Fix inconsistent whitespaces
 - Move default `filter` into the constructor

lteacher/codewars-runner-cli,OverZealous/codewars-runner-cli,Codewars/codewars-runner-cli,DonaldKellett/codewars-runner-cli,DonaldKellett/codewars-runner-cli,Codewars/codewars-runner-cli,OverZealous/codewars-runner-cli,Codewars/codewars-runner,Codewars/codewars-runner-cli,DonaldKellett/codewars-runner-cli,Codewars/codewars-runner-cli,OverZealous/codewars-runner-cli,lteacher/codewars-runner-cli,DonaldKellett/codewars-runner-cli,lteacher/codewars-runner-cli,OverZealous/codewars-runner-cli,OverZealous/codewars-runner-cli,OverZealous/codewars-runner-cli,lteacher/codewars-runner-cli,Codewars/codewars-runner-cli,DonaldKellett/codewars-runner-cli,DonaldKellett/codewars-runner-cli,Codewars/codewars-runner-cli,OverZealous/codewars-runner-cli,Codewars/codewars-runner,Codewars/codewars-runner-cli,OverZealous/codewars-runner-cli,lteacher/codewars-runner-cli,Codewars/codewars-runner-cli,lteacher/codewars-runner-cli,OverZealous/codewars-runner-cli,OverZealous/codewars-runner-cli,lteacher/codewars-runner-cli,DonaldKellett/codewars-runner-cli,Codewars/codewars-runner-cli,lteacher/codewars-runner-cli,lteacher/codewars-runner-cli,Codewars/codewars-runner,Codewars/codewars-runner-cli,Codewars/codewars-runner-cli,OverZealous/codewars-runner-cli,Codewars/codewars-runner,OverZealous/codewars-runner-cli,Codewars/codewars-runner-cli,Codewars/codewars-runner,OverZealous/codewars-runner-cli,Codewars/codewars-runner-cli,DonaldKellett/codewars-runner-cli,DonaldKellett/codewars-runner-cli,lteacher/codewars-runner-cli,OverZealous/codewars-runner-cli,Codewars/codewars-runner-cli,DonaldKellett/codewars-runner-cli,DonaldKellett/codewars-runner-cli,lteacher/codewars-runner-cli