修改已读时添加已读时间

`im_inbox`.`read_time` = NOW()

common/src/main/resources/mapper/ImInboxMapper.xml

@@ -24,7 +24,8 @@
         UPDATE im_inbox
         SET `im_inbox`.`update_time` = NOW(),
         `im_inbox`.`read_msg_status` = 1,
-        `im_inbox`.`receiver_time` = NOW()
+        `im_inbox`.`receiver_time` = NOW(),
+        `im_inbox`.`read_time` = NOW()
         WHERE
         im_inbox.receiver = #{clientId}
         AND im_inbox.fk_msg_id IN