[Xmonad] darcs patch: increase default contrast in XPrompt.

As before, if Andrea objects, I'll just move this into my Config... it feels to me like a prompt needs more contrast, since you actively want to look at it, while tabs are supposed to fade into the background when you aren't looking at them. David Fri Aug 10 10:47:24 PDT 2007 David Roundy <droundy@darcs.net> * increase default contrast in XPrompt.