[cmyth] EDL: Use enum type 'cmyth_recording_markup_t' for type of mark

And cosmetics around cmyth_mysql_get_recording_seek_offset
[mythtv-cmyth] EDL: Use enum type 'cmyth_recording_markup_t' for type of mark
[mythtv-cmyth] GetRecordingMarkup: use enum type 'cmyth_recording_markup_t'