libzvbi-teletextdec: cosmetics

Signed-off-by: Marton Balint <cus@passwd.hu>
libzvbi-teletextdec: use defined constants for bitmap char width and height

Signed-off-by: Marton Balint <cus@passwd.hu>
libzvbi-teletextdec: add chopped top row size to y offset

Signed-off-by: Marton Balint <cus@passwd.hu>
libzvbi-teletextdec: set bitmap teletext canvas dimensions

Signed-off-by: Marton Balint <cus@passwd.hu>
Merge remote-tracking branch 'cus/stable'

* cus/stable:
  libzvbi-teletextdec: set bitmap teletext canvas dimensions
  libzvbi-teletextdec: add chopped top row size to y offset
  libzvbi-teletextdec: use defined constants for bitmap char width and height
  libzvbi-teletextdec: cosmetics

Merged-by: Michael Niedermayer <michaelni@gmx.at>