UpdatesController: Don't init adapter until chapter data is ready (#6824)

Considering there's no pagination for this list, the data loading can take some
time. So this will show the existing refresh indicator instead of empty view
while the list is loading.

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

@@ -24,6 +24,7 @@
             android:layout_width="wrap_content"
             android:layout_height="match_parent"
             android:layout_gravity="end"
+            android:visibility="gone"
             app:fastScrollerBubbleEnabled="false"
             tools:visibility="visible" />