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.

Remote/Hook.hs

@@ -138,7 +138,7 @@ checkKey r h k = do
 	v <- lookupHook h action
 	liftIO $ check v
   where
-  	action = "checkpresent"
+	action = "checkpresent"
 	findkey s = key2file k `elem` lines s
 	check Nothing = error $ action ++ " hook misconfigured"
 	check (Just hook) = do