Fixes WOOMOB-890

Description

Note: I have NOT tested this PR, so please make sure to verify the value is correctly propagated to Stripe. I tried building the app locally (I don't have current provisioning profiles) and I tried downloading the firebase version (it doesn't support TTP).

The Android and iOS apps have been sending cots_device value in the reader_model parameter/meta-data on PaymentIntent.

However, with the update of Stripe SDK, we renamed this value to TAP_TO_PAY_DEVICE on Android.

The goal of this task is to bring iOS to consistency with Android and change the value to TAP_TO_PAY_DEVICE. The WooPayments server handles the value correctly after the merge of https://github.com/Automattic/transact-platform-server/pull/7539.

Testing information

1. Open the app on an iPhone
2. Tap on Orders
3. Tap on the Plus button
4. Add a product to the order
5. Tap on Collect Payment
6. Tap on Tap to Pay
7. Follow the instructions and complete the payment
8. Go to dashboard.stripe.com on your computer and verify the payment intent has TAP_TO_PAY_DEVICE value in the reader model.

Screenshots

• I have considered if this change warrants user-facing release notes and have added them to RELEASE-NOTES.txt if necessary.