Fix Magento_Checkout address formatting

[nfourteen]

Description

This pull request fixes street format spacing when multiple streets are present to be consistent across Shipping and Review & Payments checkout steps.

Manual testing scenarios

1. On the frontend, create a customer account and enter a default address (leaving the street_2 form field blank).
2. Add products to the cart and Proceed to Checkout
3. Review the shipping address formats on both Shipping and Review & Payments checkout steps
4. Update customer account address to include the street_2 form field
5. Repeat steps 2 and 3 ensuring the spacing is consistent

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 on Travis CI are green)