Corrected route name for delete action on filestable on assets

[snipe]

This fixes a bug when trying to delete an uploaded asset file where it would say that the asset does not exist and the file would not be deleted.

[what-the-diff]

PR Summary

• Improved URL Routing for File Deletions Across Tables
  The route for deleting files in the asset table has been adjusted. It used to be delete/modelfile but has now been changed to delete/assetfile. This change aligns the terminology used in the URL with the actual contents of the table, making the system more intuitive and user-friendly.

• Adjusted URL Route for Model File Deletions
  In a similar vein, the route for deleting files in the model table has been changed. Instead of the older userfile.destroy, it now uses modelfile.destroy. This more accurately reflects the operations being performed, thereby enhancing consistency and improving the logic of the URL structure.