Need a way to invert Z+ and Z-

Due top my Klipper setup, Z+ and Z- are inverted, on KlipperScreen it was easy to invert them by setting this in the Klipperscreen config, and also on Fluidd they work the correct way round, but on Ktouch they are inverted, so Z+ goes down, and Z- goes up so this needs inverting, by aadding a setting to do so or similar as other interfaces have.

Review the K-Touch Z+ and Z- motion controls and compare their direction handling with the KlipperScreen configuration and Fluidd behavior described in the issue. Identify where a user-facing inversion setting belongs, then verify both controls move in the expected directions when it is enabled and retain current behavior when it is disabled.

Written by the indexing model from the issue text.