Support button/link has incorrect padding in active state

[takshil]

The "Support" link on any plugin page has incorrect padding applied when in the active state. The padding appears unevenly distributed.

Steps to Reproduce:

1. Visit any plugin(Ex: ​https://wordpress.org/plugins/sync-content-from-notion/)
2. Click on the "Support" link to activate it
3. Observe the active state styling with excessive/incorrect padding

### Description
Fixes the Support link/button having incorrect padding on plugin pages.

Trac Ticket: https://meta.trac.wordpress.org/ticket/8147

### Problem
The "Support" link on plugin pages (e.g., [vscode-file://vscode-app/Applications/Visual%20Studio%20Code.app/Contents/Resources/app/out/vs/code/electron-browser/workbench/workbench.html https://wordpress.org/plugins/sync-content-from-notion/]) had asymmetric padding, with the right padding missing. This caused the active state to appear visually unbalanced.

Before	After

Tested on a plugin page and confirmed the Support link padding looks consistent in the active state now.

Minor suggestion: the padding could be simplified to padding: 0.64rem 1.25rem; for readability (same computed values).

[manhphucofficial]

Reviewed and tested the GitHub PR linked above. The fix resolves the uneven padding on the Support link active state and looks good from my testing.

Thanks @manhphuc for looking into this. Made the change. ✅