INTERNAL Improvement on faster redirection when previous failed

[MarijusDilys]

Questions	Answers
Branch?	Master/Release
Description?	Now on webhook if order is failure it will not go to database as failed one, instead it will be not created as order (same behavior). Refactored return.php controller for better readability and security.
EDIT: Failed orders cannot simply be redirected faster because our logic dont know does it already gathered response from webhook.php or not. Tried to also add failed orders table in mol_payments database, but it created a new bug, if there is created database recrod with same cart_id and failed, another one order which suceed with same cart_id can be understanded as failed because of webhook async work (race condition with return controller).
SOLUTION: When doing second payment with same cart when previous order has failed, identify all records in database and flag them as false for return.php controller to not verify as failed
Type?	bug fix / improvement / new feature / refactoring
How to test?	Indicate how to verify that this change works as expected.
Fixed issue ?	If none leave blank