Fix initial state for update button.

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

@@ -25,10 +25,12 @@
 
     <com.google.android.material.button.MaterialButton
         android:id="@+id/conversation_update_action"
+        style="@style/Signal.Widget.Button.Small.Primary"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:layout_marginTop="12dp"
-        style="@style/Signal.Widget.Button.Small.Primary"
-        tools:text="Learn more"/>
+        android:visibility="gone"
+        tools:text="Learn more"
+        tools:visibility="visible" />
 
 </org.thoughtcrime.securesms.conversation.ConversationUpdateItem>