Victor Gama authored Jan 15, 2018 and Carola committed Jan 15, 2018

This prevents an assertion failure thrown by UIViewCollection in
VLCServerListTVViewController caused by several VLCLocalNetworkServices
using the same serviceName and title combination. Now, duplicated items
are removed from the list.

Signed-off-by: Carola Nitz <nitz.carola@googlemail.com>