fix vue3下点击编辑，取消修改报错问题

ruoyi-api/ruoyi-api-system/src/main/java/com/ruoyi/system/api/domain/SysDept.java

@@ -9,6 +9,7 @@ import lombok.experimental.Accessors;
 
 import javax.validation.constraints.Email;
 import javax.validation.constraints.NotBlank;
+import javax.validation.constraints.NotNull;
 import javax.validation.constraints.Size;
 
 /**
@@ -42,8 +43,8 @@ public class SysDept extends TreeEntity {
      * 显示顺序
      */
     @ApiModelProperty(value = "显示顺序")
-    @NotBlank(message = "显示顺序不能为空")
-    private String orderNum;
+    @NotNull(message = "显示顺序不能为空")
+    private Long orderNum;
 
     /**
      * 负责人