fix ObservableListView & ObservableGridView get the wrong scrollY when restored #214
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Hi I'm using this library to implement my own ViewPagerTabActivity, but when I swipe and first Fragment item in FragmentAdapter got destroyed, it can't restore the right scrollY of ObservableListView because of a negative value on mPrevScrolledChildrenHeight. So I commit this change and at the same time I find that ObservableRecyclerView also has the same fix.
fix ObservableListView & ObservableGridView not restore the right scrollY state, reference: ObservableRecyclerView
Please review and accept it. Appreciated for that.