Fix/submenu long items wrap

[preda-bogdan]

Summary

I changed the style for the submenu items on mobile to account for very long menu items.
Item names now should wrap instead of overflowing.

Will affect the visual aspect of the product

YES

Screenshots

Test instructions

1. On a fresh instance with Neve
2. Create a menu where item names are very long
3. Check that all long item names are wrapped and displayed on multiple lines if required.

Check before Pull Request is ready:

• I have written a test and included it in this PR
• I have run all tests and they pass
• The code passes when running the PHP CodeSniffer
• Code meets WordPress Coding Standards for PHP, HTML, CSS and JS
• Security and Sanitization requirements have been followed
• I have assigned a reviewer or two to review this PR (if you're not sure who to assign, we can do this step for you)

Closes #4147.

[pirate-bot]

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[irinelenache]

@preda-bogdan Tested and the issue is fixed now, also tested the Neve pro PR and everything's fine there too 🚀

[pirate-bot]

🎉 This PR is included in version 3.8.0 🎉

The release is available on GitHub release

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