dense_map: discard the no longer necessary operator!=

src/entt/container/dense_map.hpp

@@ -152,11 +152,6 @@ template<typename Lhs, typename Rhs>
     return lhs.it == rhs.it;
 }
 
-template<typename Lhs, typename Rhs>
-[[nodiscard]] constexpr bool operator!=(const dense_map_iterator<Lhs> &lhs, const dense_map_iterator<Rhs> &rhs) noexcept {
-    return !(lhs == rhs);
-}
-
 template<typename Lhs, typename Rhs>
 [[nodiscard]] constexpr bool operator<(const dense_map_iterator<Lhs> &lhs, const dense_map_iterator<Rhs> &rhs) noexcept {
     return lhs.it < rhs.it;
@@ -236,11 +231,6 @@ template<typename Lhs, typename Rhs>
     return lhs.index() == rhs.index();
 }
 
-template<typename Lhs, typename Rhs>
-[[nodiscard]] constexpr bool operator!=(const dense_map_local_iterator<Lhs> &lhs, const dense_map_local_iterator<Rhs> &rhs) noexcept {
-    return !(lhs == rhs);
-}
-
 } // namespace internal
 /*! @endcond */