fix: update _onEditImage to proper V2 static method pattern

- Convert _onEditImage from instance to static method

src/apps/actor/base-sheet.js

@@ -43,7 +43,7 @@ export class DS4ActorSheet extends foundry.applications.api.HandlebarsApplicatio
       editeffect: DS4ActorSheet.prototype._onEditEffect,
       deleteeffect: DS4ActorSheet.prototype._onDeleteEffect,
       createeffect: DS4ActorSheet.prototype._onCreateEffect,
-      editImage: DS4ActorSheet.prototype._onEditImage,
+      editImage: DS4ActorSheet._onEditImage,
 
     },
   };
@@ -615,17 +615,14 @@ export class DS4ActorSheet extends foundry.applications.api.HandlebarsApplicatio
    * @param {Event} event - The triggering event
    * @param {HTMLElement} target - The target element
    */
-
-  async _onEditImage(_event, _target) {
-    const attr = "img";
-    const current = this.document.img;
+  static async _onEditImage(event, target) {
+    const field = target.dataset.field || "img";
+    const current = foundry.utils.getProperty(this.document, field);
 
     const fp = new foundry.applications.apps.FilePicker({
       type: "image",
       current: current,
-      callback: (path) => {
-        this.document.update({ [attr]: path });
-      }
+      callback: (path) => this.document.update({ [field]: path })
     });
 
     return fp.browse();