fix(测试用例): 修复缺陷列表搜索问题

--bug=1042903 --user=王旭 【测试计划】计划详情-缺陷列表-搜索框-输入标签不应该搜索成功 https://www.tapd.cn/55049933/s/1534619

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

@@ -10,7 +10,6 @@
             and (
             b.title like concat('%', #{request.keyword},'%')
             or b.num like concat('%', #{request.keyword},'%')
-            or b.tags like concat('%', #{request.keyword}, '%')
             )
         </if>
         <include refid="filters">