Convert strings using toUtf8() instead of toLocal8Bit() before using …

…ELF Hashing, fixes duplicate matching breaking where the environment isn't 8bit and toLocal8Bit() will fail. There's a small chance this will break duplicate matching for a few users who are using an 8-bit character encoding which isn't UTF8 compatible but it will fix it for far more users who might be running mythfilldatabase from a cronjob with no proper locale or similar. Refs #10449

mythtv/programs/mythfilldatabase/xmltvparser.cpp

@@ -533,7 +533,7 @@ ProgInfo *XMLTVParser::parseProgram(
         programid.append(uniqueid);
     else
     {
-        QString seriesid = QString::number(ELFHash(pginfo->title.toLocal8Bit()
+        QString seriesid = QString::number(ELFHash(pginfo->title.toUtf8()
                                                .constData()));
         pginfo->seriesId = seriesid;
         programid.append(seriesid);