### Steps to reproduce this issue

```
dubbo.registry.simplified=true 
<dubbo:service interface="org.apache.dubbo.demo.DemoService" register="false" ref="demoService" delay="5000"/>
```

when set dubbo.registry.simplified true. the dubbo.service.register won't take effect because of the `register`  key was simplified and will use default value `true`;

```
URL providerUrl = getProviderUrl(originInvoker);
...
final URL registeredProviderUrl = getRegisteredProviderUrl(providerUrl, registryUrl);
boolean register = registeredProviderUrl.getParameter("register", true);
```
may use `providerUrl` here



final ExporterChangeableWrapper<T> exporter = (ExporterChangeableWrapper<T>) bounds.get(key);
        if (exporter == null) {
            logger.warn(new IllegalStateException("error state, exporter should not be null"));
        } else {
            final Invoker<T> invokerDelegate = new InvokerDelegate<T>(originInvoker, newInvokerUrl);
            exporter.setExporter(protocol.export(invokerDelegate));
        }
        return exporter;
    }
    /**
     * Get an instance of registry based on the address of invoker
     *
     * @param originInvoker
     * @return
     */
    private Registry getRegistry(final Invoker<?> originInvoker) {
        URL registryUrl = getRegistryUrl(originInvoker);
        return registryFactory.getRegistry(registryUrl);
    }
    private URL getRegistryUrl(Invoker<?> originInvoker) {
        URL registryUrl = originInvoker.getUrl();
        if (REGISTRY_PROTOCOL.equals(registryUrl.getProtocol())) {
            String protocol = registryUrl.getParameter(REGISTRY_KEY, DEFAULT_REGISTRY);
            registryUrl = registryUrl.setProtocol(protocol).removeParameter(REGISTRY_KEY);
        }
        return registryUrl;
    }
    /**
     * Return the url that is registered to the registry and filter the url parameter once
     *