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 +90,8 @@ public class EngineExecutionStartListener implements ExecutionListener {
         String currentActivityId = execution.getCurrentActivityId();
         String assigneeListVariableName = INTERNAL_TASK_RELATION_ASSIGNEE_LIST_INFO + currentActivityId;
         if (execution.hasVariable(assigneeListVariableName)) {
-            return;
+            // 提级审批中，会操作
+            execution.removeVariable(assigneeListVariableName);
         }
         Process mainProcess = ProcessDefinitionUtil.getBpmnModel(execution.getProcessDefinitionId()).getMainProcess();
         UserTask userTask = (UserTask) mainProcess.getFlowElement(currentActivityId);