Fix looking up camera sensor in lens flare system

[iche033]

🦟 Bug fix

Summary

The camera_lens_flare.sdf world currently floods the console with the following msgs:

(2024-08-30 22:21:38.752) [error] Unable to find sensor: default::wide_angle_camera_lensflare::link::wide_angle_camera
(2024-08-30 22:21:38.752) [error] Unable to find sensor: default::camera_lensflare::link::camera
(2024-08-30 22:21:38.756) [error] Unable to find sensor: default::wide_angle_camera_lensflare::link::wide_angle_camera
(2024-08-30 22:21:38.756) [error] Unable to find sensor: default::camera_lensflare::link::camera
(2024-08-30 22:21:38.761) [error] Unable to find sensor: default::wide_angle_camera_lensflare::link::wide_angle_camera
(2024-08-30 22:21:38.762) [error] Unable to find sensor: default::camera_lensflare::link::camera

This is likely due to the behavior change introduced in #2546. The PR removes the world prefix from the camera name.

The camera and wide angle camera should now correctly generate images with lens flares

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)
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[iche033]

@Mergifyio backport gz-sim8