Preserve style architecture in custom workflows

[mtsmfm]

Summary

When using Graph mode with Anima, workflows that include ETN_KritaStyle can fail with:

Server error: Text Encoder 'clip_l' for SD 1.5 not found

The style preset may explicitly use the Anima diffusion architecture, but custom workflow parameter collection was passing style.get_models(...) directly into CustomStyleInput. In some cases, especially with
generic checkpoint filenames, that leaves the collected style models at the default SD 1.5 architecture instead of the architecture resolved from the connected model metadata.

As a result, an Anima checkpoint can be routed through the SD 1.5 text encoder path.

This change resolves the style architecture using the available checkpoint metadata before creating CustomStyleInput, so custom workflows preserve the intended architecture such as Anima.

[Acly]

Saw some people hitting this problem, thanks for the fix!