push RawFilePath down into Annex.ReplaceFile

Minor optimisation, but a win in every case, except for a couple where
it's a wash.

Note that replaceFile still takes a FilePath, because it needs to
operate on Chars to truncate unicode filenames properly.

Logs/File.hs

@@ -47,8 +47,8 @@ withLogHandle f a = do
 		bracket (setup tmp) cleanup a
   where
 	setup tmp = do
-		setAnnexFilePerm (toRawFilePath tmp)
-		liftIO $ openFile tmp WriteMode
+		setAnnexFilePerm tmp
+		liftIO $ openFile (fromRawFilePath tmp) WriteMode
 	cleanup h = liftIO $ hClose h
 
 -- | Appends a line to a log file, first locking it to prevent