Fix teletext page aspect ratio
Fix teletext page aspect ratio

It was broken by 29a4015294, which should only have modified text "subpictures"
Closes #13050
Tested-by: Julian Scheel <julian@jusst.de>

(cherry picked from commit 47f215557953d40ed0d0b38a7834917e9117cc2b)
Signed-off-by: Jean-Baptiste Kempf <7b85a41a628204b76aba4326273a3ccc74bd009a@videolan.org>

jomanmuk/vlc-2.2,jomanmuk/vlc-2.2,jomanmuk/vlc-2.2,jomanmuk/vlc-2.2,jomanmuk/vlc-2.2,jomanmuk/vlc-2.2,jomanmuk/vlc-2.2