Shipping Labels: Enable done button even when no changes are made in payment settings

[itsmeichigo]

Closes WOOMOB-633

Description

This PR updates the payment method view to enable the Confirm button even when there are no changes. Update requests are triggered only when there are changes.

Testing steps

1. Log in to a test store with Woo Shipping set up as the store owner.
2. Navigate to the Orders tab and select a completed order with at least one unfulfilled shipment.
3. Select Create shipping label button and expand the Shipment details bottom sheet.
4. Select the payment method row. Add a new payment method if there is no existing method and save the change.
5. Open the payment method view again. Confirm that that the Confirm button is enabled before any changes are made.
6. Tap the Use this card button and confirm that the screen is closed immediately without any loading state.
7. Open the payment method again and toggle the email receipt switch.
8. Tap the Use this card button and confirm that the setting is updated before the screen is dismissed.

Testing information

Tested and confirm with iPhone 16 Pro iOS 18.3.

Screenshots

Simulator.Screen.Recording.-.iPhone.16.-.2025-07-01.at.18.03.32.mp4

---

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

[wpmobilebot]

📲 You can test the changes from this Pull Request in WooCommerce iOS Prototype by scanning the QR code below to install the corresponding build.

	App Name	WooCommerce iOS Prototype
	Build Number	30937
	Version	PR #15856
	Bundle ID	com.automattic.alpha.woocommerce
	Commit	66bae3c
	Installation URL	3bmktiauikclg

Automatticians: You can use our internal self-serve MC tool to give yourself access to those builds if needed.