[vdr] NIT handling change in 1.4.3-4

NIT handling was changed in 1.4.3-4 by adding an additional check if we're actually receiving this transponder. See the current code:

             for (cChannel *Channel = Channels.First(); Channel; Channel = Channels.Next(Channel)) {
                 if (!Channel->GroupSep() && Channel->Source() == Source && Channel->Nid() == ts.getOriginalNetworkId() && Channel->Tid() == ts.getTransportStreamId()) {
                    if (Setup.UpdateChannels >= 5) {
                       if (ISTRANSPONDER(Frequency / 1000, Transponder())) { // only modify channels if we're actually receiving this transponder

The above check was added. However, the variable 'Frequency' may not always be the current transponder frequency. The current transponder could also be in the Frequencies[] array. This causes the channel update to be always disabled.

Below we search the array if the transponder of the 'Channel' is there:

                          if (!ISTRANSPONDER(Frequency / 1000, Channel->Transponder())) {
                             for (int n = 0; n < NumFrequencies; n++) {
                                 if (ISTRANSPONDER(Frequencies[n] / 1000, Channel->Transponder())) {
                                    Frequency = Frequencies[n];
                                    break;
                                    }
                                 }
                             }

Maybe the new check should be moved here, so that it uses the new correct 'Frequency' that was found from Frequencies[] in the loop above?

                          Channel->SetCableTransponderData(Source, Frequency, Modulation, SymbolRate, CodeRate);
                          }
                       }
                    found = true;
                    }
                 }