Stock status of grouped or bundle product on custom website not considering if child products assigned to this website as well

### Preconditions (*)

1. Create custom website with store and storeview
2. Create custom stock with custom source and custom website as sales channel
3. Create one simple product with qty = 5 on custom source and assign it to custom website
4. Create second simple product with qty = 20 on custom source but not assigned to custom website
5. Create bundle or grouped product with both simple products as child with default qty for both = 10, and assign it to custom website

### Steps to reproduce (*)

1. Got to bundle or grouped product page on the frontend and check stock status and try to add it to shopping cart

### Expected result (*)

1. Stock status should be 'Out of stock'

### Actual result (*)

1. Grouped or bundle product is 'In stock', but you can't add it to the shopping cart