Fix: Buttons output in extra_tablenav are too tall

[hbhalodia]

Trac ticket: https://core.trac.wordpress.org/ticket/64796

Before (button does not placed inside .actions)	After (button does not placed inside .actions)

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[github-actions]

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Props hbhalodia, mukesh27, nilambar.

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[github-actions]

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[mukeshpanchal27]

Thanks for the PR! Looks good to me.

[ernilambar]

Before	After