Regarding the Default Embedding of a Watermark in the Alpha Channel of Generated Images

With[ last week's commit](https://github.com/lllyasviel/stable-diffusion-webui-forge/pull/2684), a feature was introduced that automatically embeds a watermark in the alpha channel of generated images. While this feature can currently be disabled through settings, I believe it is inappropriate for it to be enabled by default.

Some AI artists prefer to keep their prompts and techniques confidential, and there are users who do not want their alpha channels to be modified without their knowledge. Enabling the watermark by default could lead to unintentional exposure of information, which may constitute a privacy violation.

I strongly suggest that this feature be disabled by default, allowing users to manually enable it if needed. I would appreciate your consideration on this matter.

Start by reviewing PR #2684 and the setting that controls watermark embedding, since the issue identifies that change as the source. The work is done when watermarking is disabled by default while remaining available as an explicit user setting; no test or file is named in the issue.

Written by the indexing model from the issue text.