[Mobile Payments] Remove duplicate back button from the Try Tap to Pay customer provided note screen

[AnirudhBhat]

Closes: #12778

Description

This PR removes duplicate back button that appeared on the Try Tap to Pay customer provided note screen.

Steps to reproduce

1. Navigate to the payments hub menu (more menu -> Payments)'
2. Click on "Try Tap to Pay" option
3. Click on "Try payment" option
4. In this screen, try editing the customer provided note
5. Observe the duplicate back arrow button

The tests that have been performed

Tested on both dark and light mode, tested adding notes, removing notes.

Images/gif

https://github.com/user-attachments/assets/cd6f5b94-54df-4a70-a261-a53dbeac8063

• [x] I have considered if this change warrants release notes and have added them to RELEASE-NOTES.txt if necessary. Use the "[Internal]" label for non-user-facing changes.

Reviewer (or Author, in the case of optional code reviews):

Please make sure these conditions are met before approving the PR, or request changes if the PR needs improvement:

• [x] The PR is small and has a clear, single focus, or a valid explanation is provided in the description. If needed, please request to split it into smaller PRs.
• [x] Ensure Adequate Unit Test Coverage: The changes are reasonably covered by unit tests or an explanation is provided in the PR description.
• [x] Manual Testing: The author listed all the tests they ran, including smoke tests when needed (e.g., for refactorings). The reviewer confirmed that the PR works as expected on big (tablet) and small (phone) in case of UI changes, and no regressions are added.

[wpmobilebot]

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

	App Name	WooCommerce-Wear Android
	Platform	⌚️ Wear OS
	Flavor	Jalapeno
	Build Type	Debug
	Commit	2b06f3b0288fbb564be0944bf543b392aabe4511
	Direct Download	woocommerce-wear-prototype-build-pr12787-2b06f3b.apk

[wpmobilebot]

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

	App Name	WooCommerce Android
	Platform	📱 Mobile
	Flavor	Jalapeno
	Build Type	Debug
	Commit	2b06f3b0288fbb564be0944bf543b392aabe4511
	Direct Download	woocommerce-prototype-build-pr12787-2b06f3b.apk

[dangermattic]

	1 Warning
:warning:	This PR is assigned to the milestone 20.9. The due date for this milestone has already passed. Please assign it to a milestone with a later deadline or check whether the release for this milestone has already been finished.

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