[mythtv] Channel list in Program Guide

[Klaas de Waal]

The Program Guide displayed by mythfrontend shows all channels in the
database. This includes the channels from videosources that are not
connected to a capturecard and thus can never be tuned to or recorded
from.

I think this is wrong; the Program Guide should only show channels
that can be used, so only channels from videosources that are
connected to a capturecard.

This can be easily implemented by a fix in
ChannelUtil::LoadChannels(), file channelutil.cpp:2396, change "LEFT
JOIN capturecard..." with "RIGHT JOIN capturecard ..." .

For mythtv-setup and mythfrontend this works OK but would it break
anything else, e.g. the services API or so?

Groetjes,
Klaas.