QCoreApplication: fix a clazy-rule-of-three

The local RAII class was missing the Q_DISABLE_COPY(_MOVE). Add it.

Amends f9035587b9.

Pick-to: 6.7
Change-Id: I19dfa18c301698e45353435b9b77e62332e54c31
Reviewed-by: Giuseppe D'Angelo <giuseppe.dangelo@kdab.com>
(cherry picked from commit 199a4535e7e665c656c8e35e3e3fdc5da7e5bd51)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>

src/corelib/kernel/qcoreapplication.cpp

@@ -1825,6 +1825,8 @@ void QCoreApplicationPrivate::sendPostedEvents(QObject *receiver, int event_type
 
     // Exception-safe cleaning up without the need for a try/catch block
     struct CleanUp {
+        Q_DISABLE_COPY_MOVE(CleanUp)
+
         QObject *receiver;
         int event_type;
         QThreadData *data;