pk instead of id in admin

Author: sahama

Diff for: oauth2_provider/admin.py

@@ -19,7 +19,7 @@
 
 
 class ApplicationAdmin(admin.ModelAdmin):
-    list_display = ("id", "name", "user", "client_type", "authorization_grant_type")
+    list_display = ("pk", "name", "user", "client_type", "authorization_grant_type")
     list_filter = ("client_type", "authorization_grant_type", "skip_authorization")
     radio_fields = {
         "client_type": admin.HORIZONTAL,