rule: fix "const static" declaration

rule: fix "const static" declaration

commit 06810e15bcfea356ccecde9317dd860b0f29df06 upstream.

Gcc warns against this with "-Wextra":

    src/rule.c:869:1: error: static is not at beginning of declaration [-Werror=old-style-declaration]
      869 | const static struct prio_tag std_prios[] = {
          | ^~~~~
    src/rule.c:878:1: error: static is not at beginning of declaration [-Werror=old-style-declaration]
      878 | const static struct prio_tag bridge_std_prios[] = {
          | ^~~~~

Signed-off-by: Thomas Haller <thaller@redhat.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>