add key to FileInfo

MatchingKey is not the thing to use when matching on actual worktreee
files.

Fix reversion in 8.20201116 that made include= and exclude= in
preferred/required content expressions match a path relative to the current
directory, rather than the path from the top of the repository.

CmdLine/Batch.hs

@@ -131,7 +131,7 @@ batchFilesMatching fmt a = do
 	matcher <- getMatcher
 	go $ \si f ->
 		let f' = toRawFilePath f
-		in ifM (matcher $ MatchingFile $ FileInfo (Just f') f')
+		in ifM (matcher $ MatchingFile $ FileInfo (Just f') f' Nothing)
 			( a (si, f')
 			, return Nothing
 			)