MODE-2114 Removed redundant code of reference resolving on copy. 

The code which has been removed wasn't being used because reference resolving occurs earlier in the copy logic.

The commit which replaced the logic that was removed is: https://github.com/ModeShape/modeshape/commit/68883876423d06910f55aacc882c69b474e464f7#diff-c05ab135c609ddfb3a5ff6b439a262f9R2401 and was part of MODE-2012.