Datepicker does not properly display time picker if time format is not using 0-23 hours

To reproduce:

• add a date field in a class / application
• in the date format, set the format to "dd/MM/yyyy HH:mm" (hours in 0-23 format)
• edit an object of this class, in inline form, which displays the date picker: the time picker is displayed
• in the class, change the time format, for example, to "dd/MM/yyyy hh:mm a" (hours in 1-12 format, with AM/PM marker - the marker is optional)
• edit the object of the class again, the datepicker does not display a time picker anymore. This is not normal, a time picker should be displayed in this case as well.

However, note that if the time format is set to HH:mm, the limitation described by XWIKI-14065 will be hit.