[FIX] sale_timesheet: timesheet cost with company on analytic account

FIXUP da2140b7

The above commmit was half-right in the business logic, but overlooked that if a user is not
in the company of the project, it will crash.
This use case worked before that commit

While agreeing that a little more clear access right is needed
like for example be able to get the project_time_mode_id on the companies
that are in user.company_ids,
the aim of this present commit is to avoid regression

OPW 1878204
closes #26539

addons/sale_timesheet/models/account.py

@@ -38,10 +38,10 @@ class AccountAnalyticLine(models.Model):
                 return {}
             unit_amount = values.get('unit_amount', 0.0) or self.unit_amount
             user_id = values.get('user_id') or self.user_id.id or self._default_user()
-            project = values.get('project_id') and self.env['project.project'].browse([values['project_id']]) or self.project_id
             emp = self.env['hr.employee'].search([('user_id', '=', user_id)], limit=1)
+            account = values.get('account_id') and self.env['account.analytic.account'].browse([values['account_id']]) or self.account_id or emp.account_id
             cost = emp and emp.timesheet_cost or 0.0
-            uom = project.company_id.project_time_mode_id
+            uom = account.company_id.sudo().project_time_mode_id
             # Nominal employee cost = 1 * company project UoM (project_time_mode_id)
             return {
                 'amount': -unit_amount * cost,