Fix uneven vertical spacing above/below newsletter frequency badge

Card top padding was space[3] (12px) while the badge row's
margin-bottom was space[2] (8px), making the padding above and below
the circular icon uneven. Align top padding to 8px to match.

Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>

Author: georgerichmond

dotcom-rendering/src/components/NewsletterSignupCard.tsx

@@ -22,7 +22,7 @@ export type NewsletterSignupCardProps = {
 const containerStyles = css`
 	clear: left;
 	background-color: ${themePalette('--newsletter-card-background')};
-	padding: ${space[3]}px ${space[3]}px ${space[4]}px ${space[3]}px;
+	padding: ${space[2]}px ${space[3]}px ${space[4]}px ${space[3]}px;
 `;
 
 const dividerStyles = css`