Add environment back to db:structure:load

Because of the changes in #22967 the assumption in #18907 is no longer
true because the internal metadata feature for Active Record requires
a working environment.

activerecord/lib/active_record/railties/databases.rake

@@ -302,7 +302,7 @@ db_namespace = namespace :db do
     end
 
     desc "Recreates the databases from the structure.sql file"
-    task :load => [:load_config] do
+    task :load => [:environment, :load_config] do
       ActiveRecord::Tasks::DatabaseTasks.load_schema_current(:sql, ENV['SCHEMA'])
     end