[libgda] ci: fix enabling debug for meson

[Daniel Espinosa Ortiz <despinosa src gnome org>]

commit 2da42c9522d445aaba58c36b63ce48a02298bde7
Author: Daniel Espinosa Ortiz <esodan gmail com>
Date:   Wed Jan 9 15:41:30 2019 -0600

    ci: fix enabling debug for meson

 .gitlab-ci.yml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index ab84ce26a..c1e28ec3e 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -73,7 +73,7 @@ meson_build:
   script:
   - export PGPASSWORD=$POSTGRES_PASSWORD
   - psql -h "postgres" -U "$POSTGRES_USER" -d "$POSTGRES_DB" -c "SELECT 'OK' AS status;"
-  - meson _build --prefix=/usr -Denable-ci-environment=true -Denable-debug
+  - meson _build --prefix=/usr -Denable-ci-environment=true -Denable-debug=true
   - cd _build
   - ninja
   - broadwayd &