Fix generation of the teletext descriptor
Fix generation of the teletext descriptor

The index variable in the generation function for the telext descriptor was
scaled by 8 instead of by 5.

(cherry picked from commit 614bfbaebdbfda25f2cb7015e71f997f8874930e)
Signed-off-by: Jean-Paul Saman <c35aa29dc4eb008b34a9adceca7414ea1db124ba@videolan.org>

paraeco/libdvbpsi,mwgoldsmith/dvbpsi,paraeco/libdvbpsi,mwgoldsmith/dvbpsi,mwgoldsmith/dvbpsi,mkrufky/libdvbpsi,paraeco/libdvbpsi,paraeco/libdvbpsi,mkrufky/libdvbpsi,mwgoldsmith/dvbpsi,mkrufky/libdvbpsi