Investigate issues using PVR_CONNECTION_STATE_UNKNOWN

[emveepee]

To avoid extra toast and event log messages on reconnecting, pvr.nextpvr issues PVR_CONNECTION_STATE_UNKNOWN is used n a couple of locations

https://github.com/kodi-pvr/pvr.nextpvr/blob/Matrix/src/pvrclient-nextpvr.cpp#L194

https://github.com/kodi-pvr/pvr.nextpvr/blob/Matrix/src/pvrclient-nextpvr.cpp#L423

@ksooo has identified this could cause a problem. This issue is to track this investigation