Fix energy demo (#13172)

demo/src/stubs/config_entries.ts

@@ -0,0 +1,20 @@
+import { MockHomeAssistant } from "../../../src/fake_data/provide_hass";
+
+export const mockConfigEntries = (hass: MockHomeAssistant) => {
+  hass.mockWS("config_entries/get", () => [
+    {
+      entry_id: "co2signal",
+      domain: "co2signal",
+      title: "CO2 Signal",
+      source: "user",
+      state: "loaded",
+      supports_options: false,
+      supports_remove_device: false,
+      supports_unload: true,
+      pref_disable_new_entities: false,
+      pref_disable_polling: false,
+      disabled_by: null,
+      reason: null,
+    },
+  ]);
+};