registry: discard the no longer necessary operator!=

src/entt/entity/registry.hpp

@@ -130,11 +130,6 @@ template<typename Lhs, typename Rhs>
     return lhs.it == rhs.it;
 }
 
-template<typename Lhs, typename Rhs>
-[[nodiscard]] constexpr bool operator!=(const registry_storage_iterator<Lhs> &lhs, const registry_storage_iterator<Rhs> &rhs) noexcept {
-    return !(lhs == rhs);
-}
-
 template<typename Lhs, typename Rhs>
 [[nodiscard]] constexpr bool operator<(const registry_storage_iterator<Lhs> &lhs, const registry_storage_iterator<Rhs> &rhs) noexcept {
     return lhs.it < rhs.it;