- change test to use base_application and base_contribution of the Pay Sheet...

- change test to use base_application and base_contribution of the Pay Sheet Model Line instead of base_amount (from model line and payroll service)
- replace base_salary by it's value : this is easier to understand


git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@25122 20353a03-c40f-0410-a6d1-a30d3c3de9de