Fix root padding for alignwide blocks.

[tellthemachines]

Trac ticket: https://core.trac.wordpress.org/ticket/61587

Syncs changes from WordPress/gutenberg#63207.

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[github-actions]

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Props isabel_brison, mukesh27.

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[github-actions]

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[aaronrobertshaw]

Thanks for the fix and backport @tellthemachines and @richtabor 👍

✅ Tests as advertised (on frontend, editor will need JS package updates from GB PR)
✅ Code changes match GB PR
✅ Unit tests pass locally also

6.5	6.6 Before	6.6 After

[tellthemachines]

Committed in r58685.

[andrewserong]

This change looks good to me, too, and tests nicely in the site frontend! ✅