remove module namespace

lib/openproject_meeting/engine.rb

@@ -55,7 +55,7 @@ module MeetingsPlugin
             search.register :meetings
           end
 
-          activity_provider :meetings, :default => false, :class_name => ['Meeting::Meeting', 'Meeting::MeetingAgenda', 'Meeting::MeetingMinutes']
+          activity_provider :meetings, :default => false, :class_name => ['Meeting', 'MeetingAgenda', 'MeetingMinutes']
 
           menu :project_menu, :meetings, {:controller => 'meetings', :action => 'index'}, :caption => :project_module_meetings, :param => :project_id, :after => :overview
           menu :project_menu, :new_meeting, {:controller => 'meetings', :action => 'new'}, :param => :project_id, :caption => :label_meeting_new, :parent => :meetings