55_GDS.pm: minor bugfix in rgb converter

git-svn-id: svn://svn.code.sf.net/p/fhem/code/trunk@6798 2b470e98-0d58-463d-a4d8-8e2adae1ed80

fhem/FHEM/55_GDS.pm

@@ -956,7 +956,7 @@ sub sepLine($) {
 sub _rgbd2h($) {
 	my ($input) = @_;
 	my @a = split(" ", $input);
-	my $output = sprintf( "%x%x%x", $a[0],$a[1],$a[2]);
+	my $output = sprintf( "%02x%02x%02x", $a[0],$a[1],$a[2]);
 	return $output;
 }