Further fix to previous commit

* lisp/gnus/gnus-start.el (gnus-gnus-to-quick-newsrc-format): This was
  writing a corrupt gnus-newsrc-alist into newsrc.eld.
1 job for scratch/gnus-decoded in 30 seconds (queued for 1 second)
Status Job ID Name Coverage
  Test
failed #2103
test-all

00:00:30

 
Name Stage Failure
failed
test-all Test There has been a runner system failure, please try again
  on gitlab-runner-docker cff9d373
Using Docker executor with image debian:stretch ...
Pulling docker image debian:stretch ...
ERROR: Preparation failed: Error response from daemon: Get https://registry-1.docker.io/v2/library/debian/manifests/stretch: Get https://auth.docker.io/token?scope=repository%3Alibrary%2Fdebian%3Apull&service=registry.docker.io: net/http: request canceled while waiting for connection (Client.Timeout exceeded while awaiting headers) (executor_docker.go:168:15s)
Will be retried in 3s ...
Using Docker executor with image debian:stretch ...
Pulling docker image debian:stretch ...
Using docker image sha256:e1de74e67cc70422153600785c4ce4c29843a0e59e18b634c52ca133c564437f for debian:stretch ...
ERROR: Job failed (system failure): Error response from daemon: failed to start shim: exec: "docker-containerd-shim": executable file not found in $PATH: unknown (executor_docker.go:1018:0s)