Destination should be editable if we want to be able to modify/update...

Destination should be editable if we want to be able to modify/update recipient list whenever they could not be found automatically.

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@16991 20353a03-c40f-0410-a6d1-a30d3c3de9de