iptables-nftables-compat: include all compat binaries in /usr/sbin

All compat binaries are shipped by this package, in /usr/sbin.
Signed-off-by: Arturo Borrero Gonzalez <arturo.borrero.glez@gmail.com>

debian/iptables-nftables-compat.install

-usr/sbin/xtables-compat-multi sbin
+usr/sbin/xtables-compat-multi		usr/sbin
+usr/sbin/ebtables-compat		usr/sbin
+usr/sbin/arptables-compat		usr/sbin
+usr/sbin/iptables-compat		usr/sbin
+usr/sbin/iptables-compat-save		usr/sbin
+usr/sbin/iptables-compat-restore	usr/sbin
+usr/sbin/ip6tables-compat		usr/sbin
+usr/sbin/ip6tables-compat-save		usr/sbin
+usr/sbin/ip6tables-compat-restore	usr/sbin
 lib/xtables/libebt_*.so
 lib/xtables/libarpt_*.so