Fix lovelace save (#19162)

homeassistant/components/lovelace/__init__.py

@@ -101,8 +101,8 @@ class LovelaceStorage:
 
     async def async_save(self, config):
         """Save config."""
-        self._data = {'config': config}
-        await self._store.async_save(config)
+        self._data['config'] = config
+        await self._store.async_save(self._data)
 
 
 class LovelaceYAML:

tests/components/lovelace/test_init.py

@@ -34,7 +34,7 @@ async def test_lovelace_from_storage(hass, hass_ws_client, hass_storage):
     response = await client.receive_json()
     assert response['success']
     assert hass_storage[lovelace.STORAGE_KEY]['data'] == {
-        'yo': 'hello'
+        'config': {'yo': 'hello'}
     }
 
     # Load new config