Remove unused argument

Author: wildmaples

activerecord/lib/active_record/railties/databases.rake

@@ -92,7 +92,7 @@ db_namespace = namespace :db do
     if db_configs.size == 1
       ActiveRecord::Tasks::DatabaseTasks.migrate
     else
-      mapped_versions = ActiveRecord::Tasks::DatabaseTasks.db_configs_with_versions(db_configs)
+      mapped_versions = ActiveRecord::Tasks::DatabaseTasks.db_configs_with_versions
 
       mapped_versions.sort.each do |version, db_configs|
         db_configs.each do |db_config|

activerecord/lib/active_record/tasks/database_tasks.rb

@@ -255,7 +255,7 @@ def migrate(version = nil)
         Migration.verbose = verbose_was
       end
 
-      def db_configs_with_versions(db_configs) # :nodoc:
+      def db_configs_with_versions # :nodoc:
         db_configs_with_versions = Hash.new { |h, k| h[k] = [] }
 
         with_temporary_connection_for_each do |conn|