[FIX] sale_timesheet: duplicate project from Sale Order

1) In the settings of project, enable sub-tasks.
2) Create a new project with a sub-task.
3) Create a new product (type service).
4) In the "Sales" tab of the product check the "Create a new project
but no task" in the service tracking options and select the created
project as project template.
5) Create an invoice for that service and confirm it.
The sale order is set on the tasks of the duplicated project but not on
the sub-tasks.

The `write` mechanic is override in project.task to apply modifications
done on the parent task to its sub-tasks. The method
`_subtask_write_values` is used to gather `{field: value}` pairs and
update the sub-tasks. That method is override in `sale_timesheet` in
order to force the `sale_line_id` to `False` when the project is
duplicated because the duplicated project is not attached to the sale
order of the original model.

The fix has been re-write the `sale_line_id` value on sub-tasks.

opw-1985484

closes odoo/odoo#33416

Signed-off-by: Jérome Maes (jem) <jem@openerp.com>

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