p-calendar: Keyboard/mouse interaction with time selector controls behave differently

[mchu-rf]

[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

Current behavior
https://www.primefaces.org/primeng/showcase/#/calendar

A. Selected Time Via Mouse Click

• Time selection is updated and onSelect event fires for the following changes:
  • Hours
  • Minutes
  • Seconds
  • AM/PM

B. Selected Time Via Keyboard

• Time selection is updated and onSelect event fires for AM/PM changes only.

Expected behavior

• Mouse/keyboard interaction with all time selection controls should have similar behavior.

Minimal reproduction of the problem with instructions

• Can be reproduced via PrimeNG component showcase.