remove windows --git-dir unix style path hack

This is no longer necessary, at least with msysgit 1.8.5.2.msysgit.0.
Its root cause may have been fixed by other recent git path fixes.
It was causing the webapp to fail to make repos on other drives.

Assistant/WebApp/Configurators/Local.hs

@@ -300,7 +300,6 @@ getGenKeyForDriveR drive = withNewSecretKey $ \keyid ->
 getFinishAddDriveR :: RemovableDrive -> RepoKey -> Handler Html
 getFinishAddDriveR drive = go
   where
-  	{- Set up new gcrypt special remote. -}
 	go (RepoKey keyid) = whenGcryptInstalled $ makewith $ const $ do
 		r <- liftAnnex $ addRemote $
 			makeGCryptRemote remotename dir keyid