Fix failing pytests

.gitlab-ci.yml

@@ -27,5 +27,3 @@ pytest:
     stage: test
     coverage: '/TOTAL.*\s+(\d+%)$/'
     script: tools/tests/test-pytest.sh
-    allow_failure: true
-    when: manual

briar-gtk/tests/briar_gtk/test_window.py

@@ -87,7 +87,8 @@ def briar_headless_jar(is_file):
     return is_file
 
 
-@pytest.fixture(autouse=True)
+# For some reason, this gives a '6681 Segmentation fault'. Therefore 'False'
+@pytest.fixture(autouse=False)
 def gi_dependencies(mocker):
     mocker.patch(MODULE % "Gtk")