"Sovol Base Bowden Printer" update to add resolveOrValue to retraction_speed override

[HellAholic]

Description

Fixes a crash when opening material management on Sovol SV01
The setting override referred to "machine_max_feedrate_e" which does not resolve on its own and would send a function instead of a value.

Type of change

• [X ] Bug fix (non-breaking change which fixes an issue)

How Has This Been Tested?

• [X ] Run locally from source, A-B test before and after the change.

Test Configuration:

• Operating System: Win11

Checklist:

• [ X] My code follows the style guidelines of this project as described in UltiMaker Meta and Cura QML best practices
• [X ] I have read the Contribution guide

[rburema]

Nothing wrong with a bit of defensive programming anyway -- even if a machine setting dependant on a formula feels a bit unsteady.

CURA-12342