Apply suggestion from @Copilot

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

Author: rhfranzoni

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

@@ -68,11 +68,6 @@ public decimal? qBCMono
             set { _qBCMono = value.Arredondar(4); }
         }
 
-        public bool ShouldSerializeqBCMono()
-        {
-            return qBCMono.HasValue;
-        }
-
         /// <summary>
         ///     N38 - Alíquota adRem do imposto
         /// </summary>