[gnome-calculator] CI: enable GCi ui tests

[Daniel Espinosa Ortiz <despinosa src gnome org>]

commit 24ca34dcaa3e63da4835cc9911dcccda91c774b6
Author: Daniel Espinosa <esodan gmail com>
Date:   Mon Oct 21 16:32:31 2019 -0500

    CI: enable GCi ui tests

 .gitlab-ci.yml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 3998a450..c7787b4c 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -14,7 +14,7 @@
 .build_template: &meson_build
   stage: build
   script:
-    - meson _build .
+    - meson -Dui-tests=true _build .
     - ninja -C _build install
   artifacts:
     paths: