[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>

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