fix linux .preset substitution (sed)

4 jobs for kernel_4.17 in 20 minutes and 17 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Package
passed #3091
PKGBUILD
build_pkgs

00:19:43

 
  Sign
passed #3092
signature
sign_pkgs

00:00:33

 
  Deploy
manual #3093
rsync allowed to fail manual
deploy_pkgs
 
  Stable
manual #3094
rsync allowed to fail manual
move_pkgs_to_stable