Option (or default) to lock upsampler seed to image seed

[catboxanon]

Title. The use case for this is if an image were generated with a random seed, but then I want to re-generate that image with different parameters, but using the same image seed. Currently, doing this will generate a new image entirely, as the seed used for upsampling tags is randomized again. This behavior doesn't align with other extensions like sd-dynamic-prompts, which (by default) randomizes the prompt based on the image seed.

[Cisney-Gassai]

I thought the same, this should do: #24