Fix light control standalone example

[ahcorde]

Signed-off-by: Alejandro Hernández [email protected]

🦟 Bug fix

Summary

Fixed light control standalone example

Checklist

• Signed all commits for DCO
• Added tests
• Updated documentation (as needed)
• Updated migration guide (as needed)
• codecheck passed (See contributing)
• All tests passed (See test coverage)
• While waiting for a review on your PR, please help review another open pull request to support the maintainers

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[codecov]

Codecov Report

Merging #1077 (b0c6e04) into ign-gazebo4 (4f3dd67) will not change coverage.
The diff coverage is n/a.

@@             Coverage Diff              @@
##           ign-gazebo4    #1077   +/-   ##
============================================
  Coverage        67.23%   67.23%           
============================================
  Files              243      243           
  Lines            18253    18253           
============================================
  Hits             12273    12273           
  Misses            5980     5980           

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