q23type_traits: fix build with C++23

Commit 03a7be3 forgot to use the enum
in the using declaration.

Change-Id: I1ff966c0bf669ff03bc9fffd049d64ebeb156f69
Reviewed-by: Giuseppe D'Angelo <giuseppe.dangelo@kdab.com>

src/corelib/global/q23type_traits.h

@@ -26,25 +26,20 @@ QT_BEGIN_NAMESPACE
 namespace q23 {
 // like std::is_scoped_enum
 #ifdef __cpp_lib_is_scoped_enum
-template<typename E>
-using is_scoped_enum = std::is_scoped_enum;
-
-template <typename E>
-inline constexpr bool is_scoped_enum_v = std::is_scoped_enum_v<E>;
+using std::is_scoped_enum;
 #else
 
 template <typename E, bool isEnum = std::is_enum_v<E>>
 struct is_scoped_enum :  std::negation<std::is_convertible<E, std::underlying_type_t<E>>>
 {};
 
-
 template<typename T>
 struct is_scoped_enum<T, false> : std::false_type
 {};
+#endif // __cpp_lib_is_scoped_enum
 
 template <typename E>
 inline constexpr bool is_scoped_enum_v = is_scoped_enum<E>::value;
-#endif // __cpp_lib_is_scoped_enum
 }
 
 QT_END_NAMESPACE