修复了查询subtask时被删除的子工作项影响hasChildren字段正确性的问题

src/main/resources/mapper/TaskMapper.xml

@@ -20,7 +20,7 @@
                judge.task_father_id IS NOT NULL AS has_children
         FROM task AS t
                  JOIN (SELECT staff_id, staff_fullname FROM staff) AS s ON t.task_holder_id = s.staff_id
-                 LEFT JOIN (SELECT DISTINCT task_father_id FROM task) AS judge ON t.task_id = judge.task_father_id
+                 LEFT JOIN (SELECT DISTINCT task_father_id FROM task WHERE is_deleted = 0) AS judge ON t.task_id = judge.task_father_id
         WHERE is_deleted = 0
           AND task_project_id = #{projectId}
           AND t.task_father_id = #{fatherId}