Show existing images on user edit page

[snipe]

We were not correctly variablizing the avatar field, so the image was not displaying on the edit screen

[what-the-diff]

PR Summary

• Improved Condition for Image Field Check
  The condition for reviewing if the item has an image has been modified. It now allows flexibility in specifying the image field name.
• Improved Image Source Path Attribution
  The way the system attributes the source path of an image has been updated. It now picks the path according to the resolved image field name, providing more reliability in displaying the correct image.
• Added Error Message for Image Delete Field
  In the case of any errors associated with the 'image delete' field, a specific error message will now be displayed. This enhances the troubleshooting process and makes it easier to understand where potential issues may arise.