Fix method signature in aggregated migration

Analog to core commit:
a280631fd6

Signed-off-by: Alex Coles <alex@alexbcoles.com>

db/migrate/20121022124254_aggregated_costs_migrations.rb

@@ -23,7 +23,7 @@ require 'open_project/plugins/migration_mapping'
 # This migration aggregates the migrations detailed in MIGRATION_FILES
 class AggregatedCostsMigrations < ActiveRecord::Migration
 
-  def initialize
+  def initialize(*)
     super
     @issues_table_exists = ActiveRecord::Base.connection.tables.include? 'issues'
   end