Ignore --subdir with --history or --tag-only

Location of any new files (e.g., with --subtitles-only) is determined
by location of existing media file

Author: dinkypumpkin

get_iplayer

@@ -4796,7 +4796,7 @@ sub generate_filenames {
 
 	# Don't create subdir if we are only testing recordings
 	# Create a subdir for programme sorting option
-	if ( $opt->{subdir} ) {
+	elsif ( $opt->{subdir} ) {
 		my $subdir = $prog->substitute( $opt->{subdirformat} || '<longname>', 1 );
 		if ( $opt->{isodate} ) {
 			$subdir =~ s|(\d\d)[/_](\d\d)[/_](20\d\d)|$3-$2-$1|g;