panel-list: Reorganize panel order

This does not currently implements all the changes
in panel order defined by the latest mockups [1],
but only moves Privacy and Applications to their
appropriate places.

[1] https://gitlab.gnome.org/Teams/Design/settings-mockups/blob/master/shell/settings-cleanup.png

shell/cc-panel-list.c

@@ -412,13 +412,13 @@ static const gchar * const panel_order[] = {
   "search",
   "region",
   "universal-access",
-  "online-accounts",
   "applications",
+  "privacy",
+  "online-accounts",
   "sharing",
   "sound",
   "power",
   "network",
-  "privacy",
   "devices",
   "details",