[FIX] mail: correct inheritance of popoverProps method

Missing a super call, merged the functions together for better
style-adherence to the original code

Part-of: odoo/odoo#116641

addons/mail/static/src/web/fields/many2one_avatar_user_field/many2one_avatar_user_field.js

@@ -65,19 +65,8 @@ export class KanbanMany2OneAvatarUserField extends KanbanMany2OneAvatarField {
      * All props are normally passed to the Many2OneField however since
      * we add a new one, we need to filter it out.
      */
-    get m2oFieldProps() {
-        const props = {
-            ...this.props,
-        };
-        delete props.displayAvatarName;
-        return props;
-    }
-
     get popoverProps() {
-        const props = {
-            ...super.popoverProps,
-            readonly: false,
-        };
+        const props = super.popoverProps;
         delete props.displayAvatarName;
         return props;
     }