lxd/device/nic: fix default IP for routed NIC (`ipv4.host_address`) #8505

Job	Run time
Code	8m 7s
Client (1.22.x, ubuntu-latest)	1m 7s
Documentation	5m 34s
Client (1.22.x, macos-latest)	37s
Client (1.22.x, windows-latest)	1m 47s
System (1.22.x, cluster, dir)	11m 28s
System (1.22.x, cluster, btrfs)	12m 2s
System (1.22.x, cluster, lvm)	12m 23s
System (1.22.x, cluster, zfs)	11m 59s
System (1.22.x, cluster, ceph)	16m 37s
System (1.22.x, cluster, random)	13m 39s
System (1.22.x, standalone, dir)	24m 40s
System (1.22.x, standalone, btrfs)	23m 6s
System (1.22.x, standalone, lvm)	40m 0s
System (1.22.x, standalone, zfs)	40m 55s
System (1.22.x, standalone, ceph)	1h 16m 7s
System (1.22.x, standalone, random)	24m 5s
System (stable, cluster, dir)	11m 39s
System (stable, standalone, dir)	23m 23s
Trigger snap edge build	0s
	5h 59m 15s

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