Fixes https://build.kde.org/view/Failing/job/Plasma/job/drkonqi/job/kf5-qt5%20WindowsMSVCQt5.14/
The fix still uses a deprecated method but it's the easier to put in place for now.
A clean fix would be:
```
QTextStream ts(&a);
ts << Qt::hex << "0x" << qSetFieldWidth(8) << Qt::right << i;
qDebug() << a;
```
But as we are inside argument function, it would need a bit of rework.