feat: 更新时不可修改 leafFlag

Author: cadecode

system/src/main/java/top/cadecode/uniboot/system/request/SysMenuRequest.java

@@ -46,8 +46,6 @@ public static class SysMenuUpdateRequest{
         private String componentPath;
         @NotEmpty
         private String menuName;
-        @NotNull
-        private Boolean leafFlag;
         private String icon;
         @NotNull
         private Integer orderNum;