rule: delete extra space in rule indentation

rule: delete extra space in rule indentation

Annoying extra space in rule indentation:

Example before this patch:

table ip6 test_table {
	chain test_chain {
		 counter tcp dport { 22, 80, 443} accept # handle 1
		^
	}
}

Example after this patch:

table ip6 test_table {
	chain test_chain {
		counter tcp dport { 22, 80, 443} accept # handle 1
	}
}

Signed-off-by: Arturo Borrero Gonzalez <arturo.borrero.glez@gmail.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>