fix(测试跟踪): 用例评审批量取消关联报错

--bug=1011040 --user=李玉号 [测试跟踪]github#11342Track-Review中，Batch
unlink有时会导致SQLSyntaxErrorException
https://www.tapd.cn/55049933/s/1119899

Closes #11342

backend/src/main/java/io/metersphere/base/mapper/ext/ExtTestReviewCaseMapper.xml

@@ -298,6 +298,9 @@
                     <when test="order.name == 'num'">
                         test_case.num ${order.type}
                     </when>
+                    <when test="order.name == 'custom_num'">
+                        test_case.custom_num ${order.type}
+                    </when>
                     <otherwise>
                         test_case_review_test_case.${order.name} ${order.type}
                     </otherwise>