[gvfs] Revert "ci: Add possibility to specify default image"

[Ondrej Holy <oholy src gnome org>]

commit 70a48d1a3897fc93bdfc3582aee1868658872bae
Author: Ondrej Holy <oholy redhat com>
Date:   Fri Jan 31 07:49:05 2020 +0100

    Revert "ci: Add possibility to specify default image"
    
    This reverts commit 49170edbb1a8c7ad1f439c3ce7215b487bd39890, which
    broke CI on forks, because $TAG variable is not set there...

 .gitlab-ci.yml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 98378f1e..2b8d22ae 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -1,5 +1,5 @@
 fedora:
-    image: registry.gitlab.gnome.org/gnome/gvfs:$TAG
+    image: registry.gitlab.gnome.org/gnome/gvfs:latest
     tags:
         - x86_64
     script: