fix(DEFECT-669): 设备属性出现null选项的问题修复

@@ -380,8 +380,8 @@
     <select id="findDeviceKeys" resultType="string">
         SELECT
         DISTINCT base.key as keyName
-        FROM  ts_kv_latest latest
-        LEFT JOIN ts_kv_dictionary base ON latest.key = base.key_id
+        FROM  ts_kv_dictionary base
+        LEFT JOIN ts_kv_latest latest ON latest.key = base.key_id
         LEFT JOIN device tb ON tb.ID  = latest.entity_id
         LEFT JOIN iotfs_device iot ON tb.ID :: TEXT = iot.tb_device_id
         <where>