[4.4] FIX calendar picker if weeknumbers hidden and time format 24h

[cyrezdev]

Pull Request for Issue introduced (by me 🥇 ) in PR #40761.

Affected Joomla versions: 4.4.0 and 5.0.0

Summary of Changes

Quick FIX : Time select broken if calendar form field has weeknumbers attribute on false.

Check if weeknumbers is true or false to listen to correct number of childNodes.
Calendar form field with 12h (AM/PM) time format is not affected by the issue, as well as calendar picker with week numbers (so Joomla core not affected).

Testing Instructions

Set 2 form fields of type calendar like this (with and without week numbers):

Note: default timeformat is 24 and default weeknumbers is true.

<field
	name="no_week_numbers"
	type="calendar"
	label="Test"
	description="Test without weeknumbers and time 24h"
	showtime="true"
	weeknumbers="false"
/>

<field
	name="week_numbers"
	type="calendar"
	label="Test"
	description="Test with weeknumbers and time 24h"
	showtime="true"
/>

Actual result BEFORE applying this Pull Request

You can't change Time (hour and/or minutes) with the no_week_numbers calendar picker.
It's working with the other form field.

Expected result AFTER applying this Pull Request

It's working in both cases.

Link to documentations

Please select:

• Documentation link for docs.joomla.org:

• No documentation changes for docs.joomla.org needed

• Pull Request link for manual.joomla.org:

• No documentation changes for manual.joomla.org needed