The "Windows Share" server type is non-functional in Windows OS but
still shown in the File Services (PlaceEditDialog) dialog.
This patch removes its entry from dialog on Windows only so that no more 
non-functional service can be created.

Change-Id: I440c637dd2a566f820a6e8fac826f35cabb9c05f
Reviewed-on: https://gerrit.libreoffice.org/66055
Tested-by: Jenkins
Reviewed-by: Mike Kaganski <mike.kaganski@collabora.com>