Bug 21708: Sort MARC fields in TransformHtmlToMarc

Bug 21708: Sort MARC fields in TransformHtmlToMarc

Instead of pushing 999 in the front :)

Test plan:
Do not yet apply this patch.
Edit a record. Save. And open MARC view/view plain on opac-detail.
Verify that the biblionumber field (MARC21 999) follows leader.
Apply this patch. Restart Plack.
Edit a record. Save. And open MARC view/view plain on opac-detail.
Verify that the biblionumber field is in right position.
Run t/db_dependent/Biblio/TransformHtmlToMarc.t. Should pass now.

Signed-off-by: Bernardo Gonzalez Kriegel <bgkriegel@gmail.com>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>