[FIX] hr_maintenance: remove dynamic domain

* converts dynamic domain from onchange_department_or_employee_id to a
  static domain on the field
* remove the department_id field (and all uses of it), it looks to
  never be set and not really be settable: the field is hidden in the
  form, doesn't have a default value, does not have anything to
  compute it, ...
* remove the onchange itself as it has very little value: it
  auto-selects an equipment if there exists a single equipment
  assigned to the selected employee or to no employee

  Even if we removed the "equipment not assigned to any user"
  bit (under the assumption that people would mostly request
  maintenance for their own equipment, and that this would usefully
  trigger more often) it's unlikely for dedicated users of
  hr_maintenance to assign only one equipment per employee. So the
  onchange would rarely do any useful work, and what work it saves is
  trivial: if there's only one equipment the employee could ask about
  for maintenance it's really trivial to do that.

Task 2115472

closes odoo/odoo#40963

Signed-off-by: Xavier Morel (xmo) <xmo@odoo.com>

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