Update motion_planning.py

[robertik10]

Description

As @samuelkuehnel thought, this line in the main branch might have lead to the Pipeline crashing since it doesnt have the emergency brake fix installed yet. Maybe changing this back will fix the problem until the emergency brake fix is on the main

Fixes # Pipeline crash

Type of change

Please delete options that are not relevant.

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

Does this PR introduce a breaking change?

No

Most important changes

Which files functionalities are most important in this PR. On which part should the reviewer be focused on?

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works (might be obsolete with CI later on)
• New and existing unit tests pass locally with my changes (might be obsolete with CI later on)