wgengine/wgcfg: remove two unused Config fields

They distracted me in some refactoring. They're set but never used.

Updates #17858

Change-Id: I6ec7d6841ab684a55bccca7b7cbf7da9c782694f
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>

util/deephash/tailscale_types_test.go

@@ -85,7 +85,6 @@ type tailscaleTypes struct {
 func getVal() *tailscaleTypes {
 	return &tailscaleTypes{
 		&wgcfg.Config{
-			Name:      "foo",
 			Addresses: []netip.Prefix{netip.PrefixFrom(netip.AddrFrom16([16]byte{3: 3}).Unmap(), 5)},
 			Peers: []wgcfg.Peer{
 				{