fix(测试计划): 我关注的计划列表排序报错

--bug=1049123 --user=宋昌昌 【工作台】我关注的-测试计划列表-创建时间排序报错 https://www.tapd.cn/55049933/s/1613100

backend/services/test-plan/src/main/java/io/metersphere/plan/mapper/ExtTestPlanMapper.xml

@@ -820,7 +820,7 @@
                 t.id,t.num,t.name,t.status,t.group_id,
                 t.create_user AS createUser,
                 createUser.name AS createUserName,
-                t.create_time as createTime,
+                t.create_time,
                 t.module_id as moduleId,
                 t.type,
                 t.description,
@@ -842,7 +842,7 @@
                 t.id,t.num,t.name,t.status,t.group_id,
                 t.create_user AS createUser,
                 createUser.name AS createUserName,
-                t.create_time as createTime,
+                t.create_time,
                 t.module_id as moduleId,
                 t.type,
                 t.description,