The flags were converted with 96e549c092,
but the new values only used the new `Brush` level properties in
b472570875.
Additionally, the `CurveMapping` structs were not initialized inside
the various operations that depended on them, potentially leading to
a crash if custom curves are used.
This commit fixes what was missing from both previous commitsL
* Conversion of the HSV jitter values and their curves to the new
storage location.
* Correct initialization in relevant operators
Pull Request: https://projects.blender.org/blender/blender/pulls/142104
9e44e975c1