Primeng: dropdown does not close on selection when change detection is on push

[abuscom-leonhard]

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Current behavior

If the dropdown component is used in a component with change detection onpush the dropdown does not collaps on selection. This bug has been introduced with version 6.0.2

Minimal reproduction of the problem with instructions
https://stackblitz.com/edit/angular-1kul2t

• Angular version: 6.1.0

• PrimeNG version: 6.0.2

• Browser: [Chrome 67 ]

• Language: [TypeScript]

• Node (for AoT issues): node --version = 8.9.0

[huineng]

https://github.com/primefaces/primeng/issues/6174

[cagataycivici]

Works for me using 6.1.2.