thunderbolt: move to the 'Devices' page

The 'Devices' page is a fitting place for the thunderbolt, being
an IO technology. It is expected that people that need to go to
that page will be sent there via a gnome-shell notification, so
there is no need for it to be on the main page.
Ok'ed by the design team (jimmac).

panels/thunderbolt/gnome-thunderbolt-panel.desktop.in.in

@@ -7,7 +7,7 @@ Terminal=false
 Type=Application
 NoDisplay=true
 StartupNotify=true
-Categories=GNOME;GTK;Settings;X-GNOME-Settings-Panel;HardwareSettings;X-GNOME-DevicesSettings;X-GNOME-ConnectivitySettings;
+Categories=GNOME;GTK;Settings;X-GNOME-Settings-Panel;HardwareSettings;X-GNOME-DevicesSettings;
 OnlyShowIn=GNOME;Unity;
 X-GNOME-Bugzilla-Bugzilla=GNOME
 X-GNOME-Bugzilla-Product=gnome-control-center

shell/cc-panel-list.c

@@ -276,7 +276,6 @@ static const gchar * const panel_order[] = {
   "wifi",
   "mobile-broadband",
   "bluetooth",
-  "thunderbolt",
   "background",
   "notifications",
   "search",
@@ -295,6 +294,7 @@ static const gchar * const panel_order[] = {
   "mouse",
   "printers",
   "removable-media",
+  "thunderbolt",
   "wacom",
   "color",