[FIX] hr_holidays: include time in demo data

All fields not provided default to 0, so the the exact values are
`%Y-%m-20 00:00:00` - `%Y-%m-22 00:00:00`.
Because this is only 2 days it can entirely overlap with a week-end
(e.g. 2021-02-20/21), leading to `number_of_days` computed to 0 and
triggering an error at confirmation (`"The following employees are not
supposed to work during that period"`).

Change familly trip as the same issue would occure in May 2021

closes odoo/odoo#65314

Signed-off-by: Martin Trigaux (mat) <mat@odoo.com>

addons/hr_holidays/data/hr_holidays_demo.xml

@@ -62,10 +62,10 @@
     <record id="hr_holidays_cl" model="hr.leave">
         <field name="name">Trip with Family</field>
         <field name="holiday_status_id" ref="holiday_status_comp"/>
-        <field eval="time.strftime('%Y-%m-01')" name="date_from"/>
-        <field eval="time.strftime('%Y-%m-03')" name="date_to"/>
-        <field eval="time.strftime('%Y-%m-01')" name="request_date_from"/>
-        <field eval="time.strftime('%Y-%m-03')" name="request_date_to"/>
+        <field eval="time.strftime('%Y-%m-01 08:00:00')" name="date_from"/>
+        <field eval="time.strftime('%Y-%m-03 17:00:00')" name="date_to"/>
+        <field eval="time.strftime('%Y-%m-01 08:00:00')" name="request_date_from"/>
+        <field eval="time.strftime('%Y-%m-03 17:00:00')" name="request_date_to"/>
         <field name="number_of_days">10</field>
         <field name="employee_id" ref="hr.employee_admin"/>
     </record>
@@ -80,10 +80,10 @@
     <record id="hr_holidays_sl" model="hr.leave">
         <field name="name">Doctor Appointment</field>
         <field name="holiday_status_id" ref="holiday_status_sl"/>
-        <field eval="time.strftime('%Y-%m-20')" name="date_from"/>
-        <field eval="time.strftime('%Y-%m-22')" name="date_to"/>
-        <field eval="time.strftime('%Y-%m-20')" name="request_date_from"/>
-        <field eval="time.strftime('%Y-%m-22')" name="request_date_to"/>
+        <field eval="time.strftime('%Y-%m-20 08:00:00')" name="date_from"/>
+        <field eval="time.strftime('%Y-%m-22 17:00:00')" name="date_to"/>
+        <field eval="time.strftime('%Y-%m-20 08:00:00')" name="request_date_from"/>
+        <field eval="time.strftime('%Y-%m-22 17:00:00')" name="request_date_to"/>
         <field name="number_of_days">3</field>
         <field name="employee_id" ref="hr.employee_admin"/>
         <field name="state">confirm</field>