Manager prevents SwarmUI live previews during generation

As title says.

### Problem:
After a recent, fresh SwarmUI install I could not see any live preview images during generation (in Swarm's generate tab), and troubleshooting all SwarmUI paths did not suceed.

### Temporary Solution/Possible Bug
Going into Swarm's Comfy Workflow tab and setting the ComfyUI Manager Menu to allow a Preview Method fixes the issue with Swarm's generate tab. Previews in SwarmUI now follow Swarms settings, e.g. 'No Previews [x]'.

I'm not sure this behavior is intended as Swarm should have full control right out of the box, so to speak.

Reproduce the issue on a fresh SwarmUI and ComfyUI Manager installation, then compare generation previews with the ComfyUI Manager Preview Method disabled and enabled. Trace the path that applies the manager setting during generation and verify that SwarmUI's preview preference is respected without requiring a manual Manager change.

Written by the indexing model from the issue text.