change the way to check if an account can be proposed on an accounting...

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