test(list-header): update snapshots

Author: thetaPC

core/src/components/list-header/test/basic/index.html

@@ -82,6 +82,10 @@
       </ion-content>
     </ion-app>
 
-    <style></style>
+    <style>
+      ion-content {
+        --background: #F1F1F1;
+      }
+    </style>
   </body>
 </html>