[8.13](backport #4459) Fix MacOS compatibility script syntax #4460
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What does this PR do?
Fix syntax in compatibility script for MacOS originally introduced in #1392 and modified for #4193. Modification introduced in #4193 contains a syntax error that this PR fixes
Why is it important?
Upgrade from elastic-agent < 8.5.0 needs this script to correct the target for link
/Library/Elastic/Agent/elastic-agent
to the actual elastic-agent binaryChecklist
[ ] I have commented my code, particularly in hard-to-understand areas[ ] I have made corresponding changes to the documentation[ ] I have made corresponding change to the default configuration files[ ] I have added tests that prove my fix is effective or that my feature works[ ] I have added an entry in./changelog/fragments
using the changelog tool[ ] I have added an integration test or an E2E testAuthor's Checklist
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This is an automatic backport of pull request #4459 done by [Mergify](https://mergify.com).