Fix codegen of enum types specified as lowercase in XML

Author: qed-

main/java/uk/co/real_logic/sbe/generation/csharp/CSharpGenerator.java

@@ -1106,7 +1106,7 @@ private CharSequence generateEnumProperty(final String propertyName,
  final Token token,
  final String indent)
  {
- final String enumName = token.name();
+ final String enumName = formatClassName(token.name());
  final String typePrefix = toUpperFirstChar(token.encoding().primitiveType().primitiveName());
  final String enumUnderlyingType = cSharpTypeName(token.encoding().primitiveType());
  final Integer offset = Integer.valueOf(token.offset());