[gnome-shell] network: Don't start portal helper under GDM

[Bastien Nocera <hadess src gnome org>]

commit 607b2efcce68002b44c2e7e0045e69f9e39062ac
Author: Bastien Nocera <hadess hadess net>
Date:   Sun Feb 19 16:38:07 2017 +0100

    network: Don't start portal helper under GDM
    
    https://bugzilla.gnome.org/show_bug.cgi?id=769546

 js/ui/status/network.js |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/js/ui/status/network.js b/js/ui/status/network.js
index 560743c..bedfc5e 100644
--- a/js/ui/status/network.js
+++ b/js/ui/status/network.js
@@ -2066,7 +2066,7 @@ const NMApplet = new Lang.Class({
         // (but in general we should only prompt a portal if we know there is a portal)
         if (GLib.getenv('GNOME_SHELL_CONNECTIVITY_TEST') != null)
             isPortal = isPortal || this._client.connectivity < NetworkManager.ConnectivityState.FULL;
-        if (!isPortal)
+        if (!isPortal || Main.sessionMode.isGreeter)
             return;
 
         let path = this._mainConnection.get_path();