chore(auth): restore injected schema key position

apps/emqx/src/emqx_schema.erl

@@ -214,15 +214,18 @@ roots(high) ->
                     desc => ?DESC(zones),
                     importance => ?IMPORTANCE_HIDDEN
                 }
-            )},
-        %% NOTE: authorization schema here is only to keep emqx app pure
-        %% the full schema for EMQX node is injected in emqx_conf_schema.
-        {?EMQX_AUTHORIZATION_CONFIG_ROOT_NAME,
-            sc(
-                ref(?EMQX_AUTHORIZATION_CONFIG_ROOT_NAME),
-                #{importance => ?IMPORTANCE_HIDDEN}
             )}
-    ] ++ emqx_schema_hooks:injection_point('roots.high');
+    ] ++
+        emqx_schema_hooks:injection_point('roots.high') ++
+        [
+            %% NOTE: authorization schema here is only to keep emqx app pure
+            %% the full schema for EMQX node is injected in emqx_conf_schema.
+            {?EMQX_AUTHORIZATION_CONFIG_ROOT_NAME,
+                sc(
+                    ref(?EMQX_AUTHORIZATION_CONFIG_ROOT_NAME),
+                    #{importance => ?IMPORTANCE_HIDDEN}
+                )}
+        ];
 roots(medium) ->
     [
         {"broker",