fix: delete duplicate TerminationsCfg code

[fan-ziqi]

Description

TerminationsCfg is the same as LocomotionVelocityRoughEnvCfg, there is no need to configure it again, just modify the corresponding name self.terminations.base_contact.params["sensor_cfg"].body_names

Type of change

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

Checklist

• I have run the pre-commit checks with ./isaaclab.sh --format
• 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
• I have updated the changelog and the corresponding version in the extension's config/extension.toml file
• I have added my name to the CONTRIBUTORS.md or my name already exists there