Fixed:
- TCP port got lost/reset when editing a server;
- in Gtk widget disabled comma;
- secure protocol checkbox always unchecked when editing a
  server.

Change-Id: I358fc7375552b29e4840a3616e4e47b95b88ed2c
Reviewed-on: https://gerrit.libreoffice.org/21039Reviewed-by: Jan-Marek Glogowski <glogow@fbihome.de>
Tested-by: Jan-Marek Glogowski <glogow@fbihome.de>