[xmonad] darcs patch: avoid Data.Ratio and % operator in XMonad.Config

This was inspired by a difficulty I observed by a Haskell newbie trying to configure xmonad. No reason to import this % operator that I can see. David Sun Nov 11 10:37:08 PST 2007 David Roundy <droundy@darcs.net> * avoid Data.Ratio and % operator in XMonad.Config I think this'll make Config.hs more friendly as a template for folks to modify.