[FIX] hr_holidays: display correct number of timeoff on approval view.

When timeoff is 1 day or 0.5 days then it was not going to
correctly display timeoff number on approval page due to momment.

For 1 day leave the date_to and date_from as equal so momment diff will
be 0 days and floating is off for diff so not display 0.5 for floating leave.
even we enable floating it will display the wrong floating based
on 24 hours instead of 8 working hours a day.

so get the number_of_days from db and display on leave same as department
leave summary.

Task-2071031

closes odoo/odoo#39032

X-original-commit: 6953620f507990010c593a0d35d67c81f5b27e47
Signed-off-by: Yannick Tivisse (yti) <yti@odoo.com>

addons/hr_holidays/static/src/js/leave_stats_widget.js

@@ -103,7 +103,7 @@ odoo.define('hr_holidays.LeaveStatsWidget', function (require) {
                     ['holiday_type', '=', 'employee'],
                     ['date_from', '<=', month_date_to],
                     ['date_to', '>=', month_date_from]],
-                    ['employee_id', 'date_from', 'date_to'],
+                    ['employee_id', 'date_from', 'date_to', 'number_of_days'],
                 ],
             }).then(function (data) {
                 var dateFormat = time.getLangDateFormat();
@@ -112,7 +112,7 @@ odoo.define('hr_holidays.LeaveStatsWidget', function (require) {
                     return _.extend(leave, {
                         date_from: moment(leave.date_from).format(dateFormat),
                         date_to: moment(leave.date_to).format(dateFormat),
-                        number_of_days: moment(leave.date_to).diff(moment(leave.date_from), 'days'),
+                        number_of_days: leave.number_of_days,
                     });
                 });
             });