[gtk] ci: remove allow_failure from flatpak jobs again

[Christoph Reiter <creiter src gnome org>]

commit f4857da08fc508fc0f67f89e41b5d3d68237071e
Author: Christoph Reiter <creiter src gnome org>
Date:   Mon Apr 16 11:54:47 2018 +0200

    ci: remove allow_failure from flatpak jobs again
    
    It was added in 814b7d7bb71920a due to too old wayland in the runtime.
    5b160efc768d3 fixed it by bundling a newer wayland.

 .gitlab-ci.yml | 1 -
 1 file changed, 1 deletion(-)
---
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 657360d8ee..9e0910a928 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -49,7 +49,6 @@ msys2-mingw32:
     paths:
       - "${APPID}-dev.flatpak"
     expire_in: 1 day
-  allow_failure: true
   script:
     - bash -x ./.gitlab-ci/flatpak-build.sh "${APPID}"