SpecialHomepage: Do not load start-startediting if SE aren't enabled
start-startediting gets loaded even when SuggestedEdits module
is disabled for everyone (via GEHomepageSuggestedEditsEnabled).
Bug: T273243
Change-Id: I9b372fc747c2f79cd8dc40191f139988043eca7f
(cherry picked from commit 08cd1429893ce31e86052b2411b26ec87e75caf0)