C++ SDK ParamAccessor oid() method returns wrong oid for nested params

[johndanenRV]

For example, this code segment

std::unique_ptr<ParamAccessor> param = dm_.param("/outer_nested_struct/inner_nested_struct");
std::cout << param->oid() << "\n";

would print: "/outer_nested_struct/inner_nested_struct/inner_nested_struct"

with the nested param being written twice.