[DEBSTRUCTURED] WORKAROUND: Never sync both structured and simple to …

…proxy

This can be reverted once OR-4275 is fixed!
https://atix.atlassian.net/browse/OR-4275

app/services/katello/pulp3/repository/apt.rb

@@ -39,10 +39,6 @@ def mirror_remote_options
             fail("It cannot work to set both deb_use_structured_proxy_sync and deb_use_simple_publish to False! Please set at least one of them to True!")
           end
 
-          if Setting['deb_use_simple_publish'] and not distributions.split(' ').include? 'default'
-            distributions.concat(' default')
-          end
-
           super.merge({distributions: distributions})
         end