Implemented fix for #9660 prevents finding a value for simple array of options

[Spaction]

I'm submitting a ... (check one with "x")

[x ] bug report => Search github for a similar issue or PR before submitting
[ ] feature request => Please check if request is not on the roadmap already https://github.com/primefaces/primeng/wiki/Roadmap
[ ] support request => Please do not submit support request here, instead see http://forum.primefaces.org/viewforum.php?f=35

https://stackblitz.com/edit/primeng-dropdown-demo-pte6kg?file=src%2Fapp%2Fapp.component.html

Current behavior
When binding an array of simple objects (string[], int[]), the internal value does not get set because of trying to get option.value which does not exist. This is caused by the recent change of looking if OptionLabel is defined and defaulting to option.value instead of option which is how it previously worked.

Expected behavior
Binding an array of simple elements should set the binding of ngModel or correctly update the value of the dropdown

What is the motivation / use case for changing the behavior?
Keep existing functionality for simple cases

• Angular version:
  11.0

• PrimeNG version:
  11.1.0-rc.1

• Browser:
  all