Fix unit test message to use 0-based index

        final StringBuilder sb = new StringBuilder();

        for (int index = 0; index < subtypeList.size(); index++) {

            final InputMethodSubtype subtype = subtypeList.get(index);

            sb.append((index + 1) + ": ");

            sb.append(index + ": ");

            sb.append(SubtypeLocaleUtils.getSubtypeNameForLogging(subtype));

            sb.append("\n");

        }