Fix wide angle camera visibility flags

[iche033]

🦟 Bug fix

Summary

The default visibility flags conflicts with ogre's internal reserved flags which causes heightmaps to be not visible in the camera view. This PR fixes the visibility flags in the same way that's done for a regular camera.

See gazebosim/harmonic_demo#7 for screenshot

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 #900 (f23163b) into gz-rendering8 (41f80fd) will increase coverage by 0.00%.
The diff coverage is 100.00%.

❗ Current head f23163b differs from pull request most recent head 40c57ad. Consider uploading reports for the commit 40c57ad to get more accurate results

@@              Coverage Diff               @@
##           gz-rendering8     #900   +/-   ##
==============================================
  Coverage          75.21%   75.21%           
==============================================
  Files                176      176           
  Lines              16838    16839    +1     
==============================================
+ Hits               12664    12665    +1     
  Misses              4174     4174           

Files Changed	Coverage Δ
ogre2/src/Ogre2WideAngleCamera.cc	85.24% <100.00%> (+0.02%)	⬆️