Layout children don't grow as expected [#3350259]

Problem/Motivation

When elements are placed using this library, they display full width, as they do in a coupled install. When using the flexbox-layout element, nested elements don't expand to occupy the full width of the parent, layout container.

Proposed resolution

Ensure that the immediate children of the layout get a flexbox-grow: 1 added to their styling

Issue fork next_webform-3350259

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3350259-flex-grow changes, plain diff MR !66
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