Administration: Standardize community events toggle height

[himanshupathak95]

Trac ticket: https://core.trac.wordpress.org/ticket/64999

Fixes the .community-events-toggle-location button on the Dashboard page to use min-height: 32px instead of height: 38px in mobile views (≤782px), aligning it with the admin design system standard.

[github-actions]

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