[NT-549] Keyboard dismissal when user taps save

[cdolm92]

📲 What

Fixed bug where tapping Save from the creditCardTextField dismisses the keyboard.

🤔 Why

Keyboard was blocking the user from seeing error messages, which show up below the screen.

🛠 How

Setting the zipcodeTextField as the first responder after the user finished editing the creditCardTextField prevented the keyboard from being dismissed.

👀 See

Before 🐛	After 🦋

✅ Acceptance criteria

• Go to a project page, follow steps to pledge on credit card page, select option to add a new card, fill out form with this card number: 4000000000000119 (enter any cardholder name, expiry, cvc, zip), tap Save. Keyboard dismisses and processing_error message is shown.
• Keeping the new card form open, edit the card number to 4000000000000101, tap Save. Keyboard should dismiss and cvc error is shown

[justinswart]

Thanks this seems to fix the issue with the keyboard covering the error. I think you can also remove the paymentCardTextFieldDidEndEditing now? Didn't see any other outputs depending on it.

I think we should create a ticket to improve this screen by adding an accessory view to the numeric keyboard so that it has like a next button to allow the user to easily move from the CVC field to the zip code field. This would be easier if the numeric keyboard could have a return key but iOS doesn't support that.