Fix incorrect results when ascii-control characters are used as Quote and Escape

[y-wei]

As titled, without this fix incorrect results are created:

final Reader csv = new StringReader("\u00127\u0012," +
				"\u0012EmbeddedDouble\u0012," +
				"\u0012field\u0012\u0012 t\u0012\u0012ext\u0012," +
				"\u0012field\u0012\u0012 t\u0012\u0012ext\u0012");
final CsvParserSettings settings = new CsvParserSettings();
settings.getFormat().setQuote('\u0012');
settings.getFormat().setQuoteEscape('\u0012');
settings.setUnescapedQuoteHandling(UnescapedQuoteHandling.STOP_AT_CLOSING_QUOTE);
final CsvParser csvParser = new CsvParser(settings);
final String[] row = csvParser.parseAll(csv).get(0);
// row: ["7", "EmbeddedDouble", "field\u0012\u0012 t\u0012\u0012ext", "field\u0012\u0012 t\u0012\u0012ext"]
// expect ["7", "EmbeddedDouble", "field\u0012 t\u0012ext", "field\u0012 t\u0012ext"]

while it should be the one in the added unit test.