resolve fdo#59240 - FORMATTING: Thai number shown as Arabic numerals

Change-Id: I6123f8924d7502d3b97b3254ce4e5df724e4370d
Reviewed-on: https://gerrit.libreoffice.org/1769Reviewed-by: Petr Mladek <pmladek@suse.cz>
Tested-by: Petr Mladek <pmladek@suse.cz>

svl/source/numbers/zformat.cxx

@@ -5282,7 +5282,7 @@ void SvNumberformat::impTransliterateImpl(OUStringBuffer& rStr,
     com::sun::star::lang::Locale aLocale( LanguageTag( rNum.GetLang() ).getLocale() );
 
     OUString sTemp(rStr.makeStringAndClear());
-    GetFormatter().GetNatNum()->getNativeNumberString( sTemp, aLocale, rNum.GetNatNum() );
+    sTemp = GetFormatter().GetNatNum()->getNativeNumberString( sTemp, aLocale, rNum.GetNatNum() );
     rStr.append(sTemp);
 }