[fenix] For https://github.com/mozilla-mobile/fenix/issues/26093: Use `ic_menu` instead of `ic_close`

An override for History already exists in `HistoryListItemViewHolder`, so no global override for this icon is needed.

app/src/main/res/layout/library_site_item.xml

@@ -80,7 +80,7 @@
             android:layout_height="wrap_content"
             android:background="?android:attr/selectableItemBackgroundBorderless"
             android:contentDescription="@string/content_description_menu"
-            app:srcCompat="@drawable/ic_close"
+            app:srcCompat="@drawable/ic_menu"
             app:layout_constraintBottom_toBottomOf="parent"
             app:layout_constraintEnd_toEndOf="parent"
             app:layout_constraintTop_toTopOf="parent"