rule: delete extra space in sets printing

rule: delete extra space in sets printing

The extra space is printed when sets are printed in tabulated format.

table inet test {
	set test {
		  ^
		type ipv4_addr
	}
}

However, the space is still required in printing in plain format (ie, monitor).

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