Fix error message text about invalid servo parameters (backport #2769)

[mergify[bot]]

Description

Was debugging something and realized this error message is swapped.

I'll add this later when I'm on a dev computer, but looks like we should also add a check for if ((servo_params.command_out_type == "std_msgs/Float64MultiArray") && !servo_params.publish_joint_positions && !servo_params.publish_joint_velocities) - The previous check would not trigger that as it is specific to Float64 type.

Checklist

• [ ] Required by CI: Code is auto formatted using clang-format
• [ ] Extend the tutorials / documentation reference
• [ ] Document API changes relevant to the user in the MIGRATION.md notes
• [ ] Create tests, which fail without this PR reference
• [ ] Include a screenshot if changing a GUI
• [ ] While waiting for someone to review your request, please help review another open pull request to support the maintainers

---

This is an automatic backport of pull request #2769 done by Mergify.

[mergify[bot]]

Cherry-pick of df78880a0230dbcf0ad06833d91f2c3d70d9bec3 has failed:

On branch mergify/bp/iron/pr-2769
Your branch is up to date with 'origin/iron'.

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Unmerged paths:
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    both modified:   moveit_ros/moveit_servo/src/servo.cpp

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[github-actions[bot]]

This PR is stale because it has been open for 45 days with no activity. Please tag a maintainer for help on completing this PR, or close it if you think it has become obsolete.