Favorizing an IP that's not part of a server on the list deletes all favorites except one

Entering an IP and port that's not part of any server contained in the server list, in the bottom input field labeled "Address" below the server list and hitting the "Favorite" button will delete all favourites except one and not add the manually entered address.

Steps to reproduce:

1. Open the multiplayer window and let the game load the server list
2. Favourite a couple servers (if you havn't already)
3. Enter some address in the bottom "Address" field (e.g. 8.8.8.8:88)
4. Click the "Favorite" button
5. All favourites except one should be gone

Tested on latest autobuild/rsync.