Change default camera_info_topic value to __default__

[ahcorde]

Signed-off-by: ahcorde [email protected]

🦟 Bug fix

Related with this comment gazebosim/gz-sensors#285 (comment)

Summary

Changed default value of camera topic to __default__ like the other topic names and strings.

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 #1201 (4a93c54) into sdf9 (7c89e64) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             sdf9    #1201   +/-   ##
=======================================
  Coverage   88.34%   88.34%           
=======================================
  Files          63       63           
  Lines       10082    10084    +2     
=======================================
+ Hits         8907     8909    +2     
  Misses       1175     1175           

Impacted Files	Coverage Δ
src/Camera.cc	83.48% <100.00%> (+0.07%)	⬆️

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