NSIS: Wireshark GTK is Wireshark legacy (and no Wireshark 1...) !

Change-Id: I3b4f4ca28bc7d363474bc888b6a3a8ddbdb7dab9
Reviewed-on: https://code.wireshark.org/review/3867
Reviewed-by: Evan Huus <eapache@gmail.com>
Reviewed-by: Gerald Combs <gerald@wireshark.org>
Reviewed-by: Anders Broman <a.broman58@gmail.com>