ipn,tailconfig: clean up unreleased and removed app connector service

This was never released, and is replaced by HostInfo.AppConnector.

Updates tailscale/corp#15437
Signed-off-by: James Tucker <james@tailscale.com>

ipn/ipnlocal/local.go

@@ -3192,12 +3192,6 @@ func (b *LocalBackend) peerAPIServicesLocked() (ret []tailcfg.Service) {
 			Port:  1, // version
 		})
 	}
-	if b.appConnector != nil {
-		ret = append(ret, tailcfg.Service{
-			Proto: tailcfg.AppConnector,
-			Port:  1, // version
-		})
-	}
 	return ret
 }
 
@@ -3278,13 +3272,7 @@ func (b *LocalBackend) reconfigAppConnectorLocked(nm *netmap.NetworkMap, prefs i
 	}()
 
 	if !prefs.AppConnector().Advertise {
-		var old *appc.AppConnector
-		old, b.appConnector = b.appConnector, nil
-		if old != nil {
-			// Ensure that the app connector service will not be advertised now
-			// that b.appConnector is no longer set.
-			go b.doSetHostinfoFilterServices()
-		}
+		b.appConnector = nil
 		return
 	}
 
@@ -3318,10 +3306,6 @@ func (b *LocalBackend) reconfigAppConnectorLocked(nm *netmap.NetworkMap, prefs i
 	slices.Sort(domains)
 	slices.Compact(domains)
 	b.appConnector.UpdateDomains(domains)
-
-	// Ensure that the app connector service will be advertised now that
-	// b.appConnector is set.
-	go b.doSetHostinfoFilterServices()
 }
 
 // authReconfig pushes a new configuration into wgengine, if engine