Fix script/console --sandbox warning. [#1194 state:resolved]

Signed-off-by: NPratik Naik <pratiknaik@gmail.com>

railties/lib/console_sandbox.rb

-ActiveRecord::Base.send :increment_open_transactions
+ActiveRecord::Base.connection.increment_open_transactions
 ActiveRecord::Base.connection.begin_db_transaction
 at_exit do
   ActiveRecord::Base.connection.rollback_db_transaction
-  ActiveRecord::Base.send :decrement_open_transactions
+  ActiveRecord::Base.connection.decrement_open_transactions
 end