chore: remove verbose comment

Services/System/NotificationService.qml

@@ -770,9 +770,6 @@ Singleton {
       return "";
     if (icon.startsWith("/") || icon.startsWith("file://"))
       return icon;
-    // Verify the icon exists in the theme before returning its image:// URI.
-    // Without this check, missing icons render as the purple/black checkerboard
-    // from IconImageProvider::missingPixmap instead of the notification fallback icon.
     if (!ThemeIcons.iconExists(icon))
       return "";
     return ThemeIcons.iconFromName(icon);