fix hires-fix quick button

[DenOfEquity]

https://github.com/lllyasviel/stable-diffusion-webui-forge/discussions/1184 https://github.com/lllyasviel/stable-diffusion-webui-forge/issues/1357

The Gallery object changed with gradio update, old code broken, now more simple - no need to mess around with fake_image. also added check for attempt to upscale grid image removed redundant check already covered by second assert