[cpp] Fixes mobs that aggro by sight and sound

[Frankie-hz]

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• I understand that if I do not agree to the following points by completing the checkboxes my PR will be ignored.
• I understand I should leave resolving conversations to the LandSandBoat team so that reviewers won't miss what was said.
• I have read and understood the Contributing Guide and the Code of Conduct.
• I have tested my code and the things my code has changed since the last commit in the PR and will test after any later commits.

What does this pull request do?

When a mob can link by both sight and sound the check for sight was returning false and we were never checking sound. Added a check for both.

See video for testing:
https://www.youtube.com/watch?v=haCEIwET4Es

Steps to test these changes

A current family of mobs that aggro by sight and sound are aerns inside sea.
!zone Al'Taieu
Aggro one of them near you
Try to link with sound and sight
See both work