Particles demo - run with ogre2 render engine by default

[iche033]

Signed-off-by: Ian Chen [email protected]

🦟 Bug fix

Summary

particles not supported in ogre1.x yet so run in ogre2 by default.

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

Note to maintainers: Remember to use Squash-Merge

[codecov]

Codecov Report

Merging #430 (c737441) into ign-rendering6 (c9e76e9) will not change coverage.
The diff coverage is n/a.

@@               Coverage Diff               @@
##           ign-rendering6     #430   +/-   ##
===============================================
  Coverage           53.49%   53.49%           
===============================================
  Files                 192      192           
  Lines               19560    19560           
===============================================
  Hits                10464    10464           
  Misses               9096     9096           

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