Fix name of static fields function

This way Submissions will pick it up when making fields so it will combine the static ones with the ones based on the submission

Author: siemensikkema

Sources/AdminPanel/Models/AdminPanelUser/Extensions/AdminPanelUser+Submittable.swift

@@ -5,7 +5,7 @@ import Validation
 import Vapor
 
 extension AdminPanelUser: Submittable {
-    public static func makeFields(
+    public static func makeAdditionalFields(
         for submission: Submission?,
         given user: AdminPanelUser?
     ) throws -> [Field] {