[IMP] hr_payroll_hibou: Control the 'wage_type' at the HR Contract Level

This will make it possible to be more abstract with 'work_type' or 'worked days lines' and overtime.

hr_payroll_hibou/models/__init__.py

@@ -1,4 +1,5 @@
 from . import browsable_object
+from . import hr_contract
 from . import hr_payslip
 from . import hr_salary_rule
 from . import res_config_settings