[Marketplace][Payments] Enter Payments PIN

## Precoditions
- [ ] Marketplace-dev app is installed on the test Firefox OS device
- [ ] Marketplace-dev app has been successfully launched.
- [ ]  Tester is logged in.
- [ ] Test account has PIN set up previously
- [ ] The payment flow has been triggered by clicking on the purchase button
- [ ] Enter PIN screen has loaded


## Steps to test
- [ ]  Enter valid PIN
- [ ] Click Continue


## Expected result:
- [ ]  Confirm your mobile number screen from Bango loads