extensions: libxt_rateest: output all options in save hook

extensions: libxt_rateest: output all options in save hook

ipt-restore fails to parse the ipt-save output:
zmatches -m rateest --rateest RE1 --rateest-pps --rateest-lt 5
(should be "--rateest-pps 5 --rateest-lt").  Also, the "delta" option
was never shown in -save output, but twice in some cases when using
"iptables -L".

Also, the "b/pps1" option must be shown when "delta" option is used with
relative mode.

Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>