Drop useless definition

This definition is present already into a more appropriate place, on
erp5-promise.

stack/erp5/buildout.cfg

@@ -238,9 +238,6 @@ url = ${:_profile_base_location_}/instance-cloudoo.cfg.in
 md5sum = d3b3afac9099823ba2853070324a29c8
 mode = 640
 
-# Additional Configuration
-configurator_bt5_list = erp5_core_proxy_field_legacy erp5_full_text_myisam_catalog erp5_base erp5_workflow erp5_configurator erp5_configurator_standard erp5_configurator_maxma_demo erp5_configurator_ung
-
 [template-zope-conf]
 recipe = slapos.recipe.build:download
 url = ${:_profile_base_location_}/zope.conf.in