[kotlin] Add support for enums backed by Int64 values

Author: lemonmojo

Generator/Beyond.NET.CodeGenerator/Syntax/Kotlin/KotlinTypeSyntaxWriter.cs

@@ -186,6 +186,7 @@ TypeDescriptorRegistry typeDescriptorRegistry
             var valueType = value.GetType();
 
             if (valueType == typeof(int) ||
+                valueType == typeof(long) ||
                 valueType == typeof(sbyte) ||
                 valueType == typeof(byte) ||
                 valueType == typeof(ushort) ||