Bug in date equality causes wrong initialization of dropdown with date value

[cedricboidin]

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Plunkr Case (Bug Reports)
https://stackblitz.com/edit/primeng-dropdown-pvgyuu?file=app%2Fapp.component.html

Current behavior
I create a dropdown in which options values are dates. The associated formControl was set an initial value : jan 1 2003. However, when the dropdown is first displayed, it shows jan 1 2001.

Expected behavior
The dropdown should show the label corresponding to the formControl value, jan 1 2003.

Minimal reproduction of the problem with instructions
Start the stackblitz

What is the motivation / use case for changing the behavior?
This behavior is due to a bug in date equality in ObjectUtils.ts

Please tell us about your environment:
standard

• Angular version: 6.1.7

• PrimeNG version: 6.1.3

• Browser: all

• Language: all

[cagataycivici]

PR merged, thank you.