Remove duplicated libjpeg-dev package in CI

apt was probably already deduplicating it, but it reduces the length of
this already long install line.

Signed-off-by: Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
2 jobs for ci-without-autotools in 56 seconds (queued for 6 seconds)
latest
Status Job ID Name Coverage
  Container Prep
passed #200712
container_prep

00:00:26

 
  Build
passed #200713
build-native-meson

00:00:30