fix(base): add alignment styling to a columnar fieldset

[ninaandal]

Description

Add styling to the alignment of a columnar fieldset. Issue: https://github.com/sanity-io/sanity/issues/3032

Before and after

The styling of items in the Grid with several columns are now aligned as flex-end.

What to review

Add a fieldset with more than one column and see the alignment.

Notes for release

Fix styling of alignment to a columnar fieldset

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