Windows: Fix resource leak

Task-number: QTCREATORBUG-7385

Reviewed-by: Daniel Molkentin <daniel.molkentin@nokia.com>
(cherry picked from commit e0f16c3093)

Change-Id: I85e0fc108eafea1abb7d4d559d1020163969e664
Reviewed-by: Orgad Shaneh <orgads@gmail.com>
Reviewed-by: Daniel Molkentin <daniel.molkentin@nokia.com>

src/plugins/coreplugin/progressmanager/progressmanager_win.cpp

@@ -133,6 +133,7 @@ void Core::Internal::ProgressManagerPrivate::setApplicationLabel(const QString &
         Q_UNIMPLEMENTED();
 #else
         pITask->SetOverlayIcon(winId, pix.toWinHICON(), (wchar_t*)text.utf16());
+        DestroyIcon(icon);
 #endif
     }
 }