Fix: Still allow unpacking of editable linked datablocks

Similar to 918d34a9ed, enable the button in `template_ID()`

Ref #122092

Pull Request: https://projects.blender.org/blender/blender/pulls/122199

source/blender/editors/interface/templates/interface_templates.cc

@@ -1537,7 +1537,7 @@ static void template_ID(const bContext *C,
     RNA_string_set(but->opptr, "id_name", id->name + 2);
     RNA_int_set(but->opptr, "id_type", GS(id->name));
 
-    if (ID_IS_LINKED(id)) {
+    if (!ID_IS_EDITABLE(id)) {
       UI_but_flag_enable(but, UI_BUT_DISABLED);
     }
   }