tests/qtest/vhost-user-test: Use modern virtio for vhost-user tests

All other vhost-user tests here use modern virtio, too, so let's
adjust the vhost-user-net test accordingly.

Signed-off-by: Thomas Huth <thuth@redhat.com>
Message-Id: <20250203124346.169607-1-thuth@redhat.com>
Reviewed-by: Fabiano Rosas <farosas@suse.de>
Reviewed-by: Stefano Garzarella <sgarzare@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

tests/qtest/vhost-user-test.c

@@ -1043,7 +1043,8 @@ static void test_multiqueue(void *obj, void *arg, QGuestAllocator *alloc)
 
 static uint64_t vu_net_get_features(TestServer *s)
 {
-    uint64_t features = 0x1ULL << VHOST_F_LOG_ALL |
+    uint64_t features = 0x1ULL << VIRTIO_F_VERSION_1 |
+        0x1ULL << VHOST_F_LOG_ALL |
         0x1ULL << VHOST_USER_F_PROTOCOL_FEATURES;
 
     if (s->queues > 1) {