[gnome-control-center] network: Fix warning about renamed theme property

[Bastien Nocera <hadess src gnome org>]

commit 67c1755fe7152eb5301f7188e42a431fb1fe5e29
Author: Bastien Nocera <hadess hadess net>
Date:   Wed Apr 13 13:01:26 2016 +0200

    network: Fix warning about renamed theme property
    
    Theme parsing error: <data>:1:54: The 'outline-radius' property has been renamed to '-gtk-outline-radius'

 panels/network/cc-network-panel.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/panels/network/cc-network-panel.c b/panels/network/cc-network-panel.c
index 0e70581..306a371 100644
--- a/panels/network/cc-network-panel.c
+++ b/panels/network/cc-network-panel.c
@@ -1479,7 +1479,7 @@ cc_network_panel_init (CcNetworkPanel *panel)
         gtk_container_add (GTK_CONTAINER (panel), widget);
 
         provider = gtk_css_provider_new ();
-        gtk_css_provider_load_from_data (provider, ".circular-button { border-radius: 20px; outline-radius: 
20px; }", -1, NULL);
+        gtk_css_provider_load_from_data (provider, ".circular-button { border-radius: 20px; 
-gtk-outline-radius: 20px; }", -1, NULL);
         gtk_style_context_add_provider_for_screen (gdk_screen_get_default (),
                                                    GTK_STYLE_PROVIDER (provider),
                                                    GTK_STYLE_PROVIDER_PRIORITY_APPLICATION);