Update devices.py - Make 'use-cpu all' actually apply to 'all'

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Description

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fixes issue where "--use-cpu all" properly makes SD run on CPU but leaves ControlNet (and other extensions, I presume) pointed at GPU, causing a crash in ControlNet caused by a mismatch between devices between SD and CN. This change would make all calls to get_device_for(task) return cpu when using "--use-cpu all" as an argument. This is on the assumption that "all" is meant to point everything to the CPU but I might have misunderstood the intent of the argument.

Should fix #14097 and Mikubill/sd-webui-controlnet#2247

Screenshots/videos:

Checklist:

• I have read contributing wiki page
• I have performed a self-review of my own code
• My code follows the style guidelines
• My code passes tests

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test/test_utils.py::test_get_api_url[sdapi/v1/realesrgan-models] PASSED                                                                                                                                                        [ 93%]
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