Fix species_list_controller_test.
Fix species_list_controller_test.

  Get fixture ids via fixture labels instead of hard-coded magic numbers.
  As required, reflect on object based id's so that we know their order.
  Correct references to fixture with updated labels.
  Use correct fixture in various methods:
    test_show_species_list (`species_lists(:unknown_species_list))` instead of `projects(:bolete_project)``).
    test_show_species_lists_attached_to_projects, SpeciesList.first` => species_lists(:first_species_list.  The latter may be the first list now, but that would change if someone adds a fixture whose id is hashed to a lower id.

pellaea/mushroom-observer,MushroomObserver/mushroom-observer,JoeCohen/mushroom-observer,JoeCohen/mushroom-observer,JoeCohen/mushroom-observer,pellaea/mushroom-observer,pellaea/mushroom-observer,MushroomObserver/mushroom-observer,JoeCohen/mushroom-observer,MushroomObserver/mushroom-observer,JoeCohen/mushroom-observer,raysuelzer/mushroom-observer,raysuelzer/mushroom-observer,MushroomObserver/mushroom-observer,raysuelzer/mushroom-observer,MushroomObserver/mushroom-observer,MushroomObserver/mushroom-observer,MushroomObserver/mushroom-observer,raysuelzer/mushroom-observer,JoeCohen/mushroom-observer,raysuelzer/mushroom-observer,pellaea/mushroom-observer,pellaea/mushroom-observer,JoeCohen/mushroom-observer,raysuelzer/mushroom-observer,pellaea/mushroom-observer,pellaea/mushroom-observer,raysuelzer/mushroom-observer