update to address use case where it is a field instead of a property

Author: kccarter76

SubSonic.Core.DataAccessLayer/src/Builders/DbWherePredicateBuilder/DbWherePredicateBuilderVisit.cs

@@ -350,14 +350,18 @@ protected override Expression VisitMember(MemberExpression node)
                         {
                             return VisitMemberExtended(node);
                         }
-                        else if (member.Member is FieldInfo field)
+                        else if (member.Member is FieldInfo parameter)
                         {
-                            object value = field.GetValue(constant.Value);
+                            object value = parameter.GetValue(constant.Value);
 
                             if (node.Member is PropertyInfo property)
                             {
                                 value = property.GetValue(value);
                             }
+                            else if (node.Member is FieldInfo field)
+                            {
+                                value = field.GetValue(value);
+                            }
 
                             return Visit(Expression.Constant(value));
                         }