Fix hash key removal

`KingDta::Acount.new` strips keys from supplied hashes.

```ruby
 sender = {
  :owner_street => "123 Random Street",
  :bank_account_number => "000111222",
  :bank_number => "12312312",
  :owner_name => "Richard Carsharing"}
sender.keys.include? :owner_name # => true
KingDta::Account.new(sender)
sender.keys.include? :owner_name # => false
```

This breaks some of our stuff, so I fixed it.