High: Core: Fix logging of xml with libqb

libqb matches callsites on file and line number /AND/ reuses the format strings.

This meant that

qb_log_from_external_source(__FUNCTION__, __FILE__, "%s %s",

LOG_INFO, 100, 0, "hi", "there");

qb_log_from_external_source(__FUNCTION__, __FILE__, "%s-%s",

LOG_INFO, 100, 0, "hi", "there");

would both print "hi there".