[FIX] resource_booking: Don't fail on archived resource

Steps to reproduce the problem:

- Create an employee.
- Create a resource booking combination with such employee.
- Create or modify a resource booking type including the previous combination.
- Create a resource booking using that type and combination, and
  schedule it.
- Archive the employee.
- Do any change on the resource booking type.

Current behavior:

Error saying:
"Cannot schedule these bookings because no resources are selected for them:..."

Expected behavior:
No error

The problem is that we do the checks without taking into account the
archived resource, and thus, it fails. Using active_test=False makes
them to appear for the check.

resource_booking/models/resource_booking.py

@@ -391,7 +391,9 @@ def _check_scheduling(self):
         if not has_meeting:
             return
         # Ensure all scheduled bookings have booked some resources
-        has_rbc = self.filtered("combination_id.resource_ids")
+        has_rbc = self.with_context(active_test=False).filtered(
+            "combination_id.resource_ids"
+        )
         missing_rbc = has_meeting - has_rbc
         if missing_rbc:
             raise ValidationError(