Produces class decorator usage with incorrect syntax

bad:

```ts
@classic
export default class TestComponent extends Component {
  @fullNameMacro()
  fullName;
}
```

good:

```ts
@classic
class TestComponent extends Component {
  @fullNameMacro()
  fullName;
}

export default TestComponent;
```

see https://github.com/ember-cli/eslint-plugin-ember/issues/1699 for additional context