### 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



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package org.apache.dubbo.registry.integration;
import org.apache.dubbo.common.URL;