[tracker] ci: Fix regression from previous commit

[Sam Thursfield <sthursfield src gnome org>]

commit 61d9f5085122a12b269c49089133511c17140976
Author: Sam Thursfield <sam afuera me uk>
Date:   Fri Jul 13 16:42:09 2018 +0200

    ci: Fix regression from previous commit
    
    The TESTS_ENVIRONMENT variable seemed to work OK locally, and it's documented
    in the Autotools manual, but clearly something went wrong so let's go back to
    running dbus-launch explicitly.

 .gitlab-ci.yml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index e89515849..41dfabd22 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -44,7 +44,7 @@ test-autotools-fedora27:
   script:
     - su tracker -c './autogen.sh --disable-functional-tests --prefix=/usr'
     - su tracker -c 'make -j'
-    - LANG=en_US.UTF8 VERBOSE=1 TESTS_ENVIRONMENT=dbus-launch su tracker -c 'make check'
+    - LANG=en_US.UTF8 VERBOSE=1 su tracker -c 'TESTS_ENVIRONMENT=dbus-launch make check'
 
 test-meson-fedora27:
   stage: test