Removing pretrained flag in deeppixbis extractor

4 jobs for densenet in 8 minutes (queued for 5 seconds)
Status Job ID Name Coverage
  Build
passed #187715
docker
build_linux_36

00:07:56

72.0%
passed #187716
docker
build_linux_37

00:07:48

72.0%
passed #187713
macosx
build_macosx_36

00:03:02

passed #187714
macosx
build_macosx_37

00:03:00