Perform a DVB table scanner reset after each scanned transport.

This fixes the problem that the received data from a single transport
is processed twice, leading to incorrect timeout messages and also
to a Scan Progress, in the mythtv-setup SCANNING page, of more than 100%

Fixes #13396

Signed-off-by: Klaas de Waal <kdewaal@mythtv.org>

mythtv/libs/libmythtv/channelscan/channelscan_sm.cpp

@@ -1822,6 +1822,7 @@ void ChannelScanSM::ScanTransport(const transport_scan_items_it_t &transport)
     {
         GetDTVSignalMonitor()->GetScanStreamData()->Reset();
         GetDTVSignalMonitor()->SetChannel(-1,-1);
+        GetDTVSignalMonitor()->SetDVBService(0, 0, -1);
     }
 
     // Start signal monitor for this channel