[Generate Queue] Checkbox / delete button behavior

In the Generate queue, there is the ability to check images and then press the Delete button that pops up. However, there is also a Delete button on each generated batch. Sometimes, it's easy to mistake the two buttons and accidentally delete an entire batch when the intention is only to delete a handful of checked images.

Current behavior:

• Selecting some images (but not all) from a batch and then pressing the Delete button on that batch deletes the whole batch

Suggested behavior:
- Selecting some images (but not all) from a batch and then pressing the Delete button on that batch only deletes the selected images