fix: Deno.isatty throws for negative numbers

[bartlomieju]

Closes https://github.com/denoland/deno/issues/14398

[bartlomieju]

@kt3k is this still needed? I believe you already fixed it in deno_std

[cjihrig]

This might have been worked around in std, but this is still fundamentally broken.

[kt3k]

@bartlomieju

is this still needed? I believe you already fixed it in deno_std

Not fixed in std, but I think it's not urgently needed right now as far as I know. I think we should fix the root cause instead as @cjihrig suggests

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