android: make the about dialog scrollable

Content was cut in landscape mode on smaller screens.

Change-Id: Ic3b52da7a4ba9e093946be814afa93226cc34c4b

android/experimental/LOAndroid3/res/layout/about.xml

@@ -1,5 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 
+<ScrollView>
 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
               android:layout_width="match_parent"
               android:layout_height="match_parent"
@@ -43,3 +44,4 @@
         android:textColor="@android:color/secondary_text_light"
         android:textSize="18sp"/>
 </LinearLayout>
+</ScrollView>