Removed unused variable in Shapes plugin

[ahcorde]

Signed-off-by: ahcorde [email protected]

🦟 Bug fix

Summary

Removed unused variable in Shapes plugin

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 #984 (e112343) into ign-gazebo3 (7d1a3e0) will increase coverage by 0.04%.
The diff coverage is n/a.

❗ Current head e112343 differs from pull request most recent head 8bc6bc5. Consider uploading reports for the commit 8bc6bc5 to get more accurate results

@@               Coverage Diff               @@
##           ign-gazebo3     #984      +/-   ##
===============================================
+ Coverage        77.79%   77.84%   +0.04%     
===============================================
  Files              221      221              
  Lines            12687    12687              
===============================================
+ Hits              9870     9876       +6     
+ Misses            2817     2811       -6     

Impacted Files	Coverage Δ
src/gui/plugins/shapes/Shapes.cc	31.25% <ø> (ø)
src/SimulationRunner.cc	94.49% <0.00%> (+1.06%)	⬆️

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