Fix url for back button on multishipping new shipping address

[MaxSouza]

Description (*)

Fix back button url on multishipping new shipping address

Fixed Issues (if relevant)

1. Magento/Multishipping: Setting wrong back url on creation New Customer Shipping Address Page #24701 : Magento/Multishipping: Setting wrong back url on creation New Customer Shipping Address Page

Manual testing scenarios (*)

1. Create new customer (customer should not have addresses).
2. Add some product to cart.
3. Open cart.
4. Click "Check Out with Multiple Addresses".
5. Check back button url that is hidden.

Questions or comments

Contribution checklist (*)

• Pull request has a meaningful description of its purpose
• All commits are accompanied by meaningful commit messages
• All new or changed code is covered with unit/integration tests (if applicable)
• All automated tests passed successfully (all builds are green)

[m2-assistant]

Hi @MaxSouza. Thank you for your contribution
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[MaxSouza]

@magento give me test instance

[magento-engcom-team]

Hi @MaxSouza. Thank you for your request. I'm working on Magento instance for you

[magento-engcom-team]

Hi @MaxSouza, here is your new Magento instance.
Admin access: https://pr-24827.instances.magento-community.engineering/admin
Login: admin Password: 123123q

[magento-engcom-team]

Hi @aleron75, thank you for the review.
ENGCOM-5993 has been created to process this Pull Request

[engcom-Alfa]

✔️ QA Passed

Checked on Blank theme

Before:

After:

[m2-assistant]

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