k8s: CIDR: Format IPv6 CIDR regex
k8s: CIDR: Format IPv6 CIDR regex

The precheck script complains if you don't consistently indent things,
appease it even if it makes the regex harder to read.

Signed-off-by: Joe Stringer <16a9a54ddf4259952e3c118c763138e83693d7fd@covalent.io>

michi-covalent/cilium,tklauser/cilium,cilium/cilium,eloycoto/cilium,tklauser/cilium,scanf/cilium,cilium-team/cilium,tklauser/cilium,michi-covalent/cilium,tgraf/cilium,eloycoto/cilium,tgraf/cilium,eloycoto/cilium,tgraf/cilium,scanf/cilium,tklauser/cilium,tgraf/cilium,tgraf/cilium,scanf/cilium,scanf/cilium,cilium/cilium,michi-covalent/cilium,tgraf/cilium,scanf/cilium,eloycoto/cilium,tklauser/cilium,eloycoto/cilium,cilium/cilium,scanf/cilium,cilium-team/cilium,eloycoto/cilium,cilium/cilium,eloycoto/cilium,michi-covalent/cilium,scanf/cilium,cilium/cilium,michi-covalent/cilium