Plugin Directory: Fix screenshot thumbnails stacking in Chrome 146

[dan-zakirov]

Chrome 146 changed how LayoutNG handles anonymous table boxes for <button> elements, so .image-gallery-thumbnail buttons that use display: table-cell no longer share a row - they each get their own anonymous table and stack vertically.

Swapping table-cell for inline-block fixes it. The container already has white-space: nowrap so nothing else breaks.

This is a quick temporary fix for the Chrome regression - a more modern gallery replacement is being discussed in #8083.

Fixes https://meta.trac.wordpress.org/ticket/8204

[github-actions]

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