scripted-diff: replace deprecated Q_OS_MAC with Q_OS_MACOS

-BEGIN VERIFY SCRIPT-
sed -i 's/Q_OS_MAC/Q_OS_MACOS/' $(git grep -l "Q_OS_MAC" src/qt)
-END VERIFY SCRIPT-

src/qt/notificator.h

@@ -69,7 +69,7 @@ private:
     void notifyDBus(Class cls, const QString &title, const QString &text, const QIcon &icon, int millisTimeout);
 #endif
     void notifySystray(Class cls, const QString &title, const QString &text, int millisTimeout);
-#ifdef Q_OS_MAC
+#ifdef Q_OS_MACOS
     void notifyMacUserNotificationCenter(const QString &title, const QString &text);
 #endif
 };