fixed: 退回指派办理类型错误

src/Hotline/FlowEngine/Workflows/WorkflowDomainService.cs

@@ -2387,7 +2387,7 @@ namespace Hotline.FlowEngine.Workflows
             {
                 //newStep.FlowAssignType = EFlowAssignType.User;
                 // 是否中心  临时紧急修改 后续在流程模版定义是否原办理人退回类型 来实现流程 禅道200
-                newStep.FlowAssignType = step.HandlerOrgIsCenter!.Value
+                newStep.FlowAssignType = step.BusinessType is EBusinessType.Seat or EBusinessType.Send
                     ? step.BusinessType is EBusinessType.Send ? EFlowAssignType.User : EFlowAssignType.Role
                     : EFlowAssignType.Org;
                 //if (newStep is { FlowAssignType: EFlowAssignType.Role, BusinessType: EBusinessType.Send })