Fix/walk config

[16stelter]

Proposed changes

There was a broken parameter in the walk config. Copying the sim config to the robot config produces reasonable motions. Calibration will probably still be required.

Related issues

Necessary checks

• [ ] Update package version
• [x] Run catkin colcon build
• [ ] Write documentation
• [ ] Create issues for future work
• [x] Test on your machine
• [x] Test on the robot
• [ ] Put the PR on our Project board