[c++] Don't deal with byte order in static bitset method.

Author: mjpt777

sbe-tool/src/main/java/uk/co/real_logic/sbe/generation/cpp/CppGenerator.java

@@ -668,11 +668,10 @@ private CharSequence generateChoices(final String bitsetClassName, final List<To
  "\n" +
  " static bool %1$s(const %2$s bits)\n" +
  " {\n" +
- " return %3$s(bits) & (0x1L << %4$s);\n" +
+ " return bits & (0x1L << %3$s);\n" +
  " }\n\n",
  choiceName,
  typeName,
- byteOrderStr,
  choiceBitPosition));
 
  sb.append(String.format(