Fix 'addrConn.resetTransport' error (#3004) (#3517)

net.Listener converts 0.0.0.0 to :: which fails for hosts where IPv6 is
disabled. This change uses the original listen address parameter instead
of grpcl.Addr().String().

web/web.go

@@ -413,7 +413,7 @@ func (h *Handler) Run(ctx context.Context) error {
 	)
 	av2.RegisterGRPC(grpcSrv)
-	hh, err := av2.HTTPHandler(grpcl.Addr().String())
+	hh, err := av2.HTTPHandler(h.options.ListenAddress)
 	if err != nil {
 		return err
 	}