Build fails when assertions are enabled

[MaartenBaert]

Assertions seem to be broken right now, when enabled the build fails with a number of errors like these:

snake/src/snake.cpp: In member function ‘virtual std::unique_ptr<Agent> ParameterizedCellTreeAgent::make(std::vector<int>, Config&) const’:
snake/src/snake.cpp:524:18: error: no match for ‘operator==’ (operand types are ‘__gnu_cxx::__normal_iterator<int*, std::vector<int> >’ and ‘__gnu_cxx::__alloc_traits<std::allocator<int>, int>::value_type’ {aka ‘int’})
  524 |     assert(param == params.back());
      |            ~~~~~ ^~ ~~~~~~~~~~~~~
      |            |                   |
      |            |                   __gnu_cxx::__alloc_traits<std::allocator<int>, int>::value_type {aka int}
      |            __gnu_cxx::__normal_iterator<int*, std::vector<int> >