component generator does not respect --changeDetection Flag

**Steps to Reproduce:**
```
ionic start
npm install @angular/cli@7.3.4
ng g component Test --changeDetection=OnPush --entryComponent
```

**Output:**
Generated component:
```
import { Component, OnInit } from '@angular/core';

@Component({
selector: 'app-training-options',
templateUrl: './training-options.component.html',
styleUrls: ['./training-options.component.scss'],
})
export class TrainingOptionsComponent implements OnInit {

constructor() { }

ngOnInit() {}

}
```

**My `ionic info`:**
```
Ionic:

ionic (Ionic CLI) : 4.10.3 (C:\Users\distante\AppData\Roaming\npm\node_modules\ionic)
Ionic Framework : @ionic/angular 4.0.2
@angular-devkit/build-angular : 0.12.4
@angular-devkit/schematics : 7.3.4
@angular/cli : 7.3.4
@ionic/angular-toolkit : 1.4.0

System:

NodeJS : v10.14.1 (C:\Program Files\nodejs\node.exe)
npm : 6.5.0
OS : Windows 10
```

**Other Information:**
Using a Pure angular Project `ng g` generates the correct component.

Reproduce the issue with the listed ionic start and ng generate component commands, then compare the Ionic toolkit generator with the Angular CLI generator, which reportedly handles the flag correctly. Trace how the component generator processes --changeDetection=OnPush; done means the generated component reflects the requested change-detection strategy.

Rédigé par le modèle d'indexation à partir du texte de l'issue.