Fix toggle indicator collapse on On This Day widget

Scope the `.inside` flex layout to `:not(.closed)` so the global
`.js .closed .inside { display: none }` rule wins when the postbox
is minimized.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: 2 people

src/wp-admin/css/on-this-day.css

@@ -54,7 +54,7 @@
 	/* To honour the postbox border-radius. */
 	overflow: hidden;
 
-	& .inside {
+	&:not(.closed) .inside {
 		margin: 0;
 		padding: 0;
 		max-height: 560px;