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.

Annex/FileMatcher.hs

@@ -106,7 +106,7 @@ tokenizeMatcher = filter (not . null ) . concatMap splitparens . words
 largeFilesMatcher :: Annex (FileMatcher Annex)
 largeFilesMatcher = go =<< annexLargeFiles <$> Annex.getGitConfig
   where
-  	go Nothing = return matchAll
+	go Nothing = return matchAll
 	go (Just expr) = do
 		gm <- groupMap
 		rc <- readRemoteLog