style: remove redundant light-theme CSS block from playlist item

Delete an unnecessary media query that set `.meta` color for the
light color scheme in the recent-playlists playlist-item stylesheet.
The rule duplicated default styling and added extra specificity,
so removing it simplifies the CSS and avoids redundant overrides.

This reduces stylesheet size and potential maintenance confusion while
preserving visual behaviour across themes.

libs/ui/components/src/lib/recent-playlists/playlist-item/playlist-item.component.scss

@@ -26,13 +26,6 @@ mat-list-item {
     margin-top: 2px !important;
 }
 
-// Light theme
-@media (prefers-color-scheme: light) {
-    .meta {
-        color: rgba(0, 0, 0, 0.6);
-    }
-}
-
 .cdk-drag-preview {
     box-sizing: border-box;
     border-radius: 12px;