Bad filtering of XTream live streams

[gromez]

My IPTV provider has channel names like this: |RU| Kinomiks 173
On https://github.com/linuxmint/hypnotix/blob/master/usr/lib/hypnotix/xtream.py#L583 there is a check on first char and | is not passing this check so, almost all the channels are missing.
I tried to remove this check and then it works fine.

[superolmo]

@gromez Maybe changing isalnum to isascii is a better way to discard the subgroups. Maybe one day Hypnotix will be able to handle those too.

[gromez]

@superolmo yes, I confirm it's ok with isascii, all subgroups are categorized in xEverythingElse group.