webui2: rework filter form appearance

Signed-off-by: Richard Marko <rmarko@fedoraproject.org>
webui2: pep8

Signed-off-by: Richard Marko <rmarko@fedoraproject.org>
webui2: add missing import

Signed-off-by: Richard Marko <rmarko@fedoraproject.org>
webui2: filter EOLed releases, sort select fields

Signed-off-by: Richard Marko <rmarko@fedoraproject.org>
webui2: filter and order graph releases

Signed-off-by: Richard Marko <rmarko@fedoraproject.org>