change the way to check if an account can be proposed on an accounting transction line, getProperty is not supposed to do acquisition, so getProperty('simulation_state') on an accounting transaction line will always return the default. Call getSimulationState directly (which is actually acquired from parent transaction)

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@23506 20353a03-c40f-0410-a6d1-a30d3c3de9de