Correct file path for clamonacc service

[craddm]

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⤴️ Summary

Fixes the file path for the ClamAV on-access scanning service, which is in /usr/sbin/ rather than /usr/bin. The location of clamdscan was checked and is correct.

🌂 Related issues

Closes #1722

🔬 Tests

Deployed a PostgresSQL server after correcting the file path in the relevant file and confirmed that it was now running correctly. Note that this change will also apply to all other Linux VMs. I have checked several and confirmed that the /usr/sbin/ location is correct.