feat(REQ-4468) - 解决转交、加签、提级审批动作后，配置回退操作，原转交、加签、提级审批的节点的人均可能不对

workflow-engine-core/src/main/java/cn/axzo/workflow/core/engine/listener/EngineExecutionStartListener.java

@@ -90,7 +90,7 @@ public class EngineExecutionStartListener implements ExecutionListener {
         String currentActivityId = execution.getCurrentActivityId();
         String assigneeListVariableName = INTERNAL_TASK_RELATION_ASSIGNEE_LIST_INFO + currentActivityId;
         if (execution.hasVariable(assigneeListVariableName)) {
-            // 提级审批中，会操作
+            // 加签、转交、提级审批的动作中，会操作该变量，导致回退后，只用了当时被变更后的人，就不符合逻辑了
             execution.removeVariable(assigneeListVariableName);
         }
         Process mainProcess = ProcessDefinitionUtil.getBpmnModel(execution.getProcessDefinitionId()).getMainProcess();