Update getInstanceAndFidFromCTA size check

In CatalogueFetch.cpp and RestoreFilesCmd.cpp there is this check:

  if(listedTapeFiles.size() != 1) {
    throw std::runtime_error("Unexpected result set: listedTapeFiles size expected=1 received=" + std::to_string(listedTapeFiles.size()));
  }

It should be 1 or 2 because 2 will be returned if there is a dual copy. It should be:

  if(listedTapeFiles.size() != 1 && listedTapeFiles.size() != 2) {
    throw std::runtime_error("Unexpected result set: listedTapeFiles size expected=(1 | 2) received=" + std::to_string(listedTapeFiles.size()));
  }