tdf#120703 PVS: V560 Properly compare current to cDecimalSepAlt

V560 A part of conditional expression is always false: current == cDecimalSep.

Assuming a copypaste error in commit 21052ba2.
Compare to a similar case below (line 817).

Change-Id: Iebd84aa8df3e37b9a5e4fdc7ce7a25a0704a260f
Reviewed-on: https://gerrit.libreoffice.org/63269
Tested-by: Jenkins
Reviewed-by: Eike Rathke <erack@redhat.com>

i18npool/source/characterclassification/cclass_unicode_parser.cxx

@@ -745,7 +745,7 @@ void cclass_Unicode::parseText( ParseResult& r, const OUString& rText, sal_Int32
                         else
                             r.TokenType = KParseType::ASC_NUMBER;
                     }
-                    else if (current == cDecimalSep || (bDecSepAltUsed = (cDecimalSepAlt && current == cDecimalSep)))
+                    else if (current == cDecimalSep || (bDecSepAltUsed = (cDecimalSepAlt && current == cDecimalSepAlt)))
                     {
                         if (nextChar)
                             ++nDecSeps;