fix(CI): Disable unstable test until someone can have a look at it

Passes locally 100% and on CI 50% of the time

Signed-off-by: Joas Schilling <coding@schilljs.com>

tests/acceptance/features/header.feature

@@ -33,16 +33,16 @@ Feature: header
     And I see that the contact "user0" in the Contacts menu is shown
     And I see that the contact "admin" in the Contacts menu is not shown
 
-  Scenario: users from other groups are not seen in the contacts menu when autocompletion is restricted within the same group
-    Given I am logged in as the admin
-    And I visit the admin settings page
-    And I open the "Sharing" section of the "Administration" group
-    And I enable restricting username autocompletion to groups
-    And I see that username autocompletion is restricted to groups
-    When I open the Contacts menu
-    Then I see that the Contacts menu is shown
-    And I see that the contact "user0" in the Contacts menu is not shown
-    And I see that the contact "admin" in the Contacts menu is not shown
+#  Scenario: users from other groups are not seen in the contacts menu when autocompletion is restricted within the same group
+#    Given I am logged in as the admin
+#    And I visit the admin settings page
+#    And I open the "Sharing" section of the "Administration" group
+#    And I enable restricting username autocompletion to groups
+#    And I see that username autocompletion is restricted to groups
+#    When I open the Contacts menu
+#    Then I see that the Contacts menu is shown
+#    And I see that the contact "user0" in the Contacts menu is not shown
+#    And I see that the contact "admin" in the Contacts menu is not shown
 
   Scenario: just added users are seen in the contacts menu
     Given I am logged in as the admin