[16.0][FIX]hr_timesheet_sheet_autodraft: fix department in timesheet sheet

[quirino95]

When an employee requests some time-off, timesheet sheet is created if it doesn't exist, but sometimes department could be set wrong. By default, it's set with the same department of who approves time-off.

This is not correct, so my fix set department as the same of the employee who requested time-off.

These are the steps to reproduce the bug:

1. Module hr_timesheet_sheet_autodraft should be active and Auto-draft Timesheet setting should be checked;
2. Assign department A to employee 1
3. Assign department B to employee 2
4. Make sure project and task are correctly set in the time-off type that will be used for the test;
5. Employee 1 requests time-off;
6. Employee 2 approves time-off;

On approval, a new timesheet will be created for employee 1 with the department of employee 2.
With this fix, timesheet will be created with department of employee 1.

[github-actions]

There hasn't been any activity on this pull request in the past 4 months, so it has been marked as stale and it will be closed automatically if no further activity occurs in the next 30 days.
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[aleuffre]

@OCA/human-resources-maintainers Hi, this is a simple PR, could we ask for a review? We can FW once it's merged. Thanks!