Default for files_single_copy should disable the feature

Based on the findings in ENT-6440 it looks like the default value for files_single_copy which is currently defined as

files_single_copy => { @(def.control_agent_files_single_copy) };

triggers the code that implements the single copy functionality. Either the value is wrong or the code interprets it incorrectly because the default behavior should be that the single copy functionality is ignored.