Android: Make the header focusable

otherwise the settings list scrolling is not working properly
on Android Oreo(Tv)

Source/Android/app/src/main/res/layout/list_item_settings_header.xml

@@ -2,6 +2,7 @@
 <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
              xmlns:tools="http://schemas.android.com/tools"
              android:layout_width="match_parent"
+             android:focusable="true"
              android:layout_height="48dp">
 
     <TextView