revert to previous version behavior of setting hub.appURL (#1148)

- remove fallback that sets appUrl to settings.Meta.AppURL
- prefer using current browser URL in generated config if APP_URL not set

beszel/internal/hub/hub.go

@@ -112,8 +112,6 @@ func (h *Hub) initialize(e *core.ServeEvent) error {
 	// set URL if BASE_URL env is set
 	if h.appURL != "" {
 		settings.Meta.AppURL = h.appURL
-	} else {
-		h.appURL = settings.Meta.AppURL
 	}
 	if err := e.App.Save(settings); err != nil {
 		return err