vdr-addon: fix utf-8 in vdr.start

before (bad)
Jun 15 19:54:32 openelec user.err vdr: [2298] codeset is 'ANSI_X3.4-1968' - unknown

now
Jun 15 20:04:38 openelec user.err vdr: [2608] codeset is 'UTF-8' - known

closes #2380