Mark calendar tile RF test as Mandelbug in all versions (take 2)

Author: hvelarde

src/collective/cover/tests/test_calendar_tile.robot

@@ -6,16 +6,15 @@ Library  Remote  ${PLONE_URL}/RobotRemote
 Suite Setup  Open Test Browser
 Suite Teardown  Close all browsers
 
-# FIXME: this test is randomly failing
-Default Tags  Mandelbug
-
 *** Variables ***
 
 ${calendar_tile_location}  'collective.cover.calendar'
 
 *** Test cases ***
 
 Test Calendar Tile
+    [Tags]  Mandelbug
+
     Enable Autologin as  Site Administrator
     Go to Homepage
     Create Cover  Title  Description