Fixed #15037 - Removed custom fieldsets on auditing - it’s not used (yet)

[snipe]

There was a regression introduced where we were apparently trying to handle custom field values on an audit, but we don't have the UI for that at this time so it was overwriting the custom field values on auditing. This at least removes that logic for now.

[what-the-diff]

PR Summary

• Removal of Encryption/Decryption Logic
  The team has eliminated a section of code within the AssetsController.php file that was previously responsible for managing the encryption and decryption of some asset information. This change suggests a move towards a more efficient or more secure means of handling sensitive data.

• Adjustment in Array Input Handling
  In the previous version, there was code in place to convert array inputs into string format. This piece of code was removed, which could indicate a change in the structure of data or the method of data input that the system accepts.

• Code Cleaning
  Adding a blank line after the removal of certain codes signifies clean coding habits. This is part of regular code maintenance to ensure that our software is readable and easily maintainable for maximum productivity.