Adjust blend radius in test data

[martiniil]

Description

These changes fix the test case test_lin_lin_blend_execution in tst_api_execution_stop.py.

The blend radius should be strictly less than the distance between start- end endpoint of the LIN commands. Before it was equal for one of the LIN commands.

Things to add, update or check by the maintainers before this PR can be merged.

• [x] Public api function documentation
• [x] Architecture documentation reflects actual code structure
• [x] Tutorials
• [x] Overview on ROS wiki
• [x] Package Readme (example pilz_robots)
• [x] Good commit messages (some tips)
• [x] CHANGELOG.rst updated
• [x] Copyright headers
• [x] Examples

Review Checklist

• [x] Soft- and hardware architecture (diagrams and description)
• [x] Test review (test plan and individual test cases)
• [x] Documentation describes purpose of file(s) and responsibilities
• [x] Code (coding rules, style guide)

Release planning (please answer)

• [x] When is the new feature released? See #331
• [x] Which dependent packages do have to be released simultaneously? See #331

[martiniil]

The testing-builds are the only ones which can be successful at the moment. Coverage needs https://github.com/PilzDE/industrial_ci_addons/pull/7.