Fix: model download fails when server defaults to gzip

[ansonkao]

gzip breaks Content-Length and makes downloads slower.
Content-Length is expected by the progress-bar logger in download_file()

[ansonkao]

Confirming this resolved an issue I had with a CDN I was downloading files from

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
comfy_cli/command/models/models.py	0.00%	1 Missing ⚠️

Flag	Coverage Δ
unittests	44.75% <0.00%> (-0.02%)	⬇️

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Files with missing lines	Coverage Δ
comfy_cli/command/models/models.py	32.98% <0.00%> (-0.18%)	⬇️