datapath: Fix map cleanup for CT maps
datapath: Fix map cleanup for CT maps

The CT map prefix list in staleMapWalker() would only trim the
"cilium_ct" part of the name, but not the IP or protocol part.
Fix this.

Fixes: 750b3f9e58c4 ("bpf: Split connection tracking for TCP and non-TCP")

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

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