.gitlab-ci.yml: Fix "overnight-tests-no-cache" job

freedesktop-sdk/bootstrap/project.conf doesn't exist anymore

This completes d61e0582
16 jobs for master in 38 minutes and 51 seconds
Status Job ID Name Coverage
  Test
passed #174981790
allowed to fail
code_quality

00:09:58

passed #174981789
docs

00:11:40

passed #174981787
lint

00:07:26

passed #174981783
tests-centos-7.6

00:27:30

passed #174981779
tests-debian-9

00:28:09

passed #174981780
tests-fedora-28

00:27:48

passed #174981781
tests-fedora-29

00:22:18

passed #174981785
tests-fedora-missing-deps

00:15:03

passed #174981786
allowed to fail
tests-fedora-update-deps

00:23:20

passed #174981782
tests-ubuntu-18.04

00:19:32

passed #174981784
tests-unix

00:19:28

passed #174981788
wsl allowed to fail
tests-wsl

00:37:30

 
  Post
passed #174981791
analysis

00:00:45

passed #174981792
coverage

00:01:18

86.18%
passed #174981793
pages

00:00:20

 
  Deploy
passed pages:deploy

00:00:03