Revert "cluster: fix wg1 generation (AllowedIPs)"

This reverts commit f0c09c2176.

pkg/cluster/wireguard.go

@@ -97,10 +97,14 @@ func (m *Cluster) WriteWireguardConfig(ring rings.RingID) error {
 // WriteWireguardConfig rewrites all wgN.conf on all machines
 // on the Zone attached to that ring
 func (z *Zone) WriteWireguardConfig(ring rings.RingID) error {
-	if ring == rings.RingZeroID || ring == rings.RingOneID {
+	switch ring {
+	case rings.RingZeroID:
 		return writeWireguardConfig(z.zones, z.zones, ring)
-	}
+	case rings.RingOneID:
+		return writeWireguardConfig(z.zones, z, ring)
+	default:
 		return ErrInvalidRing(ring)
+	}
 }
 
 func writeWireguardConfig(z ZoneIterator, m MachineIterator, ring rings.RingID) error {