Remove fixed width from world control

[nkoenig]

Signed-off-by: Nate Koenig nate@openrobotics.org

🦟 Bug fix

The world control widget used a fix width, set via the gui.config file. This prevents the world control widget from scaling based on the content of the widget.

Checklist

• Signed all commits for DCO
• Added tests
• Updated documentation (as needed)
• Updated migration guide (as needed)
• Consider updating Python bindings (if the library has them)
• 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

Note to maintainers: Remember to use Squash-Merge and edit the commit message to match the pull request summary while retaining Signed-off-by messages.

[codecov]

Codecov Report

Merging #1805 (2b7a9bf) into gz-sim7 (4fa1f26) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           gz-sim7    #1805   +/-   ##
========================================
  Coverage    64.37%   64.37%           
========================================
  Files          341      341           
  Lines        27132    27132           
========================================
  Hits         17467    17467           
  Misses        9665     9665           

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