Fixes erroneous error "Read access denied" when using load_object() on a file path containing an OID for an object that has been destructed. The error now correctly states "Cannot load a clone."

base/internal/file.cc->legal_path()              // <-- This would return 0
src/packages/core/file.cc->check_valid_path()    // <-- Causing this to return 0
vm/internal/simulate.cc->load_object()           // <-- Causing this to return 'Read access denied."

load_object() in simulate.cc already contained logic to disallow '#' for clones which generates appropriate error messaging. This was never being hit due to how '#' was being handled in legal_path()