Handle the format '?' in number formatting (qax-os#2080)

Author: kurtinge

numfmt.go

@@ -5006,7 +5006,7 @@ func (nf *numberFormat) printNumberLiteral(text string) string {
 		if token.TType == nfp.TokenTypeLiteral {
 			result += token.TValue
 		}
-		if token.TType == nfp.TokenTypeHashPlaceHolder || token.TType == nfp.TokenTypeZeroPlaceHolder {
+		if token.TType == nfp.TokenTypeHashPlaceHolder || token.TType == nfp.TokenTypeZeroPlaceHolder || token.TType == nfp.TokenTypeDigitalPlaceHolder {
 			digits, str := handleDigitsLiteral(text, len(token.TValue), intPartLen, hashZeroPartLen)
 			intPartLen += digits
 			result += str

numfmt_test.go

@@ -3635,6 +3635,7 @@ func TestNumFmt(t *testing.T) {
 		{"123", "[$x.-unknown]MM/DD/YYYY", "x.05/02/1900"},
 		{"1234.5678", "0.0xxx00", "1234.5xxx68"},
 		{"80145.899999999994", "[$¥-8004]\" \"#\" \"####\"\"", "¥ 8 0146"},
+		{"1", "?", "1"},
 		// Unsupported number format
 		{"37947.7500001", "0.00000000E+000", "37947.7500001"},
 		{"123", "[DBNum4][$-804]yyyy\"年\"m\"月\";@", "123"},