Replace non-breaking-space with space

(this was confusing ghc on the hackage server)

Author: edsko

Distribution/Server/Framework/BackupRestore.hs

@@ -5,7 +5,7 @@
 {-# LANGUAGE MultiParamTypeClasses      #-}
 {-# LANGUAGE RankNTypes                 #-}
 {-# LANGUAGE RecordWildCards            #-}
-{-# LANGUAGE ScopedTypeVariables        #-}
+{-# LANGUAGE ScopedTypeVariables        #-}
 {-# OPTIONS_GHC -fno-warn-orphans #-}
 
 module Distribution.Server.Framework.BackupRestore (