Dual scrollbar in contact list

[dshatz]

Hello

When using the library on my device, there are two scrollbars in the Activity:

1. "scrollbar" (VerticalRecyclerViewFastScroller)
2. native RecyclerView's scrollbar (only appears when scrolling).

That's how it looks:

For me, it seems strange. Why do we need the native RecyclerView's scrollbar? It is explicitly set with android:scrollbars="vertical" on the RecyclerView in cp_contact_list.xml.

Is it an accident or is it intended for some reason? I can either remove that or add an extra parameter to show/hide it. What do you think?

[LeonardooBorges]

I forget to do that in my PR, I could do that after @1gravity review and before the merge.