HPCC-11191 - Restoring archived workunits GeneratedDlls incorrect

GenerateDlls were being restored, such that the registered query dlls
pointed to the sasha archive directory. That meant the Associated file
references that were also GeneratedDlls were no longer accessible.
Change so that the restore, copies back to the Associated file location.

Signed-off-by: Jake Smith <jake.smith@lexisnexis.com>