Fix issue with Mypaint presets when Slow Tracking interacts with Stabilizer

If a user activate Krita Stabilizer (or other smoothing option) in combination
with the Mypaint presets that use 'Slow Tracking' (Mypaint's built-in smoothing/stabilizer),
the result is polygonal strokes. Removing 'Slow Tracking' (switching to 0) delegate fully
stabilisation to Krita via tool option and prevents the polygonal lines.

BUG:447562