Added tickers in the reader page slider (#7760)

* Added tickers in the reader page slider

Default setting is off, under the reader page

* Revert "Added tickers in the reader page slider"

This reverts commit 51910dc65ae965b92d2cfe6a4d28df4ad27288a2.

* Added reader page slider tickers via xml

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

@@ -113,7 +113,8 @@
                         android:layout_height="wrap_content"
                         android:layout_weight="1"
                         android:maxHeight="?attr/actionBarSize"
-                        android:minHeight="?attr/actionBarSize" />
+                        android:minHeight="?attr/actionBarSize"
+                        app:tickVisible="true"/>
 
                     <TextView
                         android:id="@+id/right_page_text"