QCoreApplication: fix a clazy-rule-of-three

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

Amends f9035587b98ac5dc9491e642b8ec84470ec03f0e.

Pick-to: 6.8 6.7
Change-Id: I19dfa18c301698e45353435b9b77e62332e54c31
Reviewed-by: Giuseppe D'Angelo <giuseppe.dangelo@kdab.com>

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;