fixed dash-separated user warning

[JToolGD]

Proposed change(s)

When building the code I got the following warnings:

UserWarning: Usage of dash-separated 'script-dir' will not be supported in future versions. Please use the underscore name 'script_dir' instead

UserWarning: Usage of dash-separated 'install-scripts' will not be supported in future versions. Please use the underscore name 'install_scripts' instead

Types of change(s)

• [x] Bug fix

Testing and Verification

I did as the user warning said and simply replaced the dash with an underscore.

Test Configuration:

• Unity machine OS + version: [Ubuntu 20.04]
• ROS machine OS + version: [Ubuntu 20.04, ROS2 Foxy]

Checklist

• [x] Ensured this PR is up-to-date with the dev branch
• [x] Created this PR to target the dev branch
• [x] Followed the style guidelines as described in the Contribution Guidelines
• [ ] Added tests that prove my fix is effective or that my feature works
• [ ] Updated the Changelog and described changes in the Unreleased section
• [ ] Updated the documentation as appropriate

Other comments

[unity-cla-assistant]

All committers have signed the CLA.