Apply suggestion from @Copilot

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Author: rhfranzoni

NFe.Classes/Informacoes/Detalhe/Tributacao/Estadual/ICMS53.cs

@@ -123,11 +123,6 @@ public decimal? vICMSMonoDif
             set { _vICMSMonoDif = value.Arredondar(2); }
         }
 
-        public bool ShouldSerializevICMSMonoDif()
-        {
-            return vICMSMonoDif.HasValue;
-        }
-
         /// <summary>
         ///     N39 - Valor do ICMS próprio devido
         /// </summary>