Spotted by inspection. status.IPV6 should only hold v6 addresses
that we prepped earlier. Only the allocv4 is merged and holds both
but not v4.

Fixes: b2ff83a ("ipam: Provide ownership information of IP allocations")
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>

After both fixes, result now looks proper:

  # ./cilium/cilium status --verbose -o json
  [...]
  "ipam": {
    "allocations": {
      "192.168.1.229": "health",
      "192.168.211.128": "router",
      "192.168.247.238": "/ [restored]",
      "2001:db8:5::213c": "router",
      "2001:db8:5::9761": "health",
      "2001:db8:5::d965": "/ [restored]"
    },
    "ipv4": [
      "192.168.247.238",
      "192.168.1.229",
      "192.168.211.128"
    ],
    "ipv6": [
      "2001:db8:5::213c",
      "2001:db8:5::9761",
      "2001:db8:5::d965"
    ],
    "status": "IPv4: 3/65535 allocated from 192.168.0.0/16, IPv6: 3/65535 allocated from 2001:db8:5::/112"
  },
  [...]

Fixes: #9099
Fixes: ef23e9c ("ipam: Define interface for allocator")
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>