fix: use valid kube-vip log flag value

kube-vip expects an unsigned integer for --log. Replace --log -4 with --log 4 so manifest generation no longer fails during bootstrap.

nixos/kubeadm/modules/k8s-common.nix

@@ -184,7 +184,7 @@ in
       echo "==> Creating kube-vip static pod manifest"
       ctr image pull "${kubeVipImage}"
       ctr run --rm --net-host "${kubeVipImage}" kube-vip-manifest /kube-vip manifest pod \
-        --log -4 \
+        --log 4 \
         --interface "$iface" \
         --address "$vip" \
         --controlplane \
@@ -296,7 +296,7 @@ in
       mkdir -p /etc/kubernetes/manifests
       ctr image pull "${kubeVipImage}"
       ctr run --rm --net-host "${kubeVipImage}" kube-vip /kube-vip manifest pod \
-        --log -4 \
+        --log 4 \
         --interface "$iface" \
         --address "$vip" \
         --controlplane \