examples: Don't use a file section if you don't need it

Exception is ./moby.yaml where it serves as an example.

Signed-off-by: Rolf Neugebauer <rolf.neugebauer@docker.com>

projects/landlock/landlock.yml

@@ -22,9 +22,6 @@ services:
      - CAP_SYS_ADMIN
     oomScoreAdj: -800
     readonly: true
-files:
-  - path: etc/docker/daemon.json
-    contents: '{"debug": true}'
 outputs:
   - format: kernel+initrd
   - format: iso-bios