fix scrambled/hd channel scan

from wirbelscan:
  #define SCAN_TV        ( 1 << 0 )
  #define SCAN_RADIO     ( 1 << 1 )
  #define SCAN_FTA       ( 1 << 2 )
  #define SCAN_SCRAMBLED ( 1 << 3 )
  #define SCAN_HD        ( 1 << 4 )
Merge pull request #119 from stefansaraev/scanfix

fix scrambled/hd channel scan