Do not cancel RawConfig composes which are still generating.
Raw Config composes can override default `config.pungi_timeout`,
but the `fail_lost_generating_composes` method does not count with
that and fails if they take longer than `conf.pungi_timeout * 2`.
This commit fixes that by using the real overriden `pungi_timeout`
for Raw Config composes.
Signed-off-by: Jan Kaluza <jkaluza@redhat.com>