scripts/feeds: display "X" as revision of uninitialized feeds

So far we were displaying "local" which could be misinterpreted. It
wasn't possible e.g. to say if src-link feed was initialized or not.
Hopefully "X" makes (a bit) more sense.

Signed-off-by: Rafał Miłecki <rafal@milecki.pl>

scripts/feeds

@@ -333,7 +333,7 @@ sub list {
 			my $localpath = "./feeds/$feed->[1]";
 			my $m = $update_method{$feed->[0]};
 			my $revision;
-			if( !$m->{'revision'} ) {
+			if (!-d "$localpath" || !$m->{'revision'}) {
 				$revision = "X";
 			}
 			elsif( $m->{'controldir'} && -d "$localpath/$m->{'controldir'}" ) {