[ScanSetup] Add option for predefined DVB-T frequency in manual scan

If the currently active service is DVB-T and the transponder is included
in the NIM config (Terrestrial provider), open 'Manual Scan' displaying
DVB-T predefined transponder list and advance the list to the transponder
of the currently active service.

Thanks Huevos

http://forums.openpli.org/topic/33460-manual-scan-add-option-predefined-transponder-for-dvb-t/