Updates ng-core routes configurations



### How it works
It uses `getHeaders, listHeaders, itemHeaders`.

### Improvement suggestion
It should be replace by an object such as:

```typescript
{
  methods: {
   get: {
     headers: {
       Accept: 'application/json'
     }
   }
}
```

The following 3 projects should be updated:
- ng-core 
- rero-ils-ui
- sonar-ui