Improved default peer handling (#674)

* create default peers for newly created interfaces (#666)

* allow to manually create default peers for an interface (#666)

internal/app/api/v0/handlers/endpoint_config.go

@@ -145,7 +145,7 @@ func (e ConfigEndpoint) handleSettingsGet() http.HandlerFunc {
 				MinPasswordLength:         e.cfg.Auth.MinPasswordLength,
 				AvailableBackends:         controllerFn(),
 				LoginFormVisible:          !e.cfg.Auth.HideLoginForm || !hasSocialLogin,
-				CreateDefaultPeer:         e.cfg.Core.CreateDefaultPeer,
+				CreateDefaultPeer:         e.cfg.DefaultPeerCreationEnabled(),
 			})
 		}
 	}