make "git annex help options" work outside a git repo

Option parsing for commands that run outside git repos is still screwy,
as there is no Annex monad and so the flags cannot be passed in. But,
any remaining parameters can be, which is enough for this fix.

Command.hs

@@ -55,7 +55,7 @@ noMessages c = c { cmdnomessages = True }
 
 {- Adds a fallback action to a command, that will be run if it's used
  - outside a git repository. -}
-noRepo :: IO () -> Command -> Command
+noRepo :: (CmdParams -> IO ()) -> Command -> Command
 noRepo a c = c { cmdnorepo = Just a }
 
 {- Adds options to a command. -}