CI: fix indentation

2 jobs for master in 11 minutes and 20 seconds (queued for 19 minutes and 54 seconds)
Status Job ID Name Coverage
  Build
passed #4222
build-nautilus

00:06:01

 
  Test
failed #4223
test

00:05:18

 
Name Stage Failure
failed
test Test There is an unknown failure, please try again

Upgraded:
libselinux.x86_64 2.7-3.fc27 libsepol.x86_64 2.7-2.fc27

Complete!
$ ninja test -C _build
ninja: fatal: chdir to '_build' - No such file or directory
ninja: Entering directory `_build'
ERROR: Job failed: exit code 1