fix some mixed space+tab indentation

This fixes all instances of " \t" in the code base. Most common case
seems to be after a "where" line; probably vim copied the two space layout
of that line.

Done as a background task while listening to episode 2 of the Type Theory
podcast.

Utility/Daemon.hs

@@ -175,7 +175,7 @@ winLockFile pid pidfile = do
 	cleanstale
 	return $ prefix ++ show pid ++ suffix
   where
-  	prefix = pidfile ++ "."
+	prefix = pidfile ++ "."
 	suffix = ".lck"
 	cleanstale = mapM_ (void . tryIO . removeFile) =<<
 		(filter iswinlockfile <$> dirContents (parentDir pidfile))