Fix VPN inline that accidentally got removed

coin/vpn/admin.py

@@ -26,6 +26,7 @@ class VPNConfigurationAdmin(ConfigurationAdminFormMixin, PolymorphicChildModelAd
     actions = (delete_selected, "generate_endpoints", "generate_endpoints_v4",
                "generate_endpoints_v6", "activate", "deactivate")
     exclude = ("password",)
+    inline = VPNConfigurationInline
     # TODO: this should be done in the generic configuration admin.
     inlines = (IPSubnetInline, )