formula: remove std_npm_args from system's pretty_args

[branchvincent]

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Fixes #17774 (comment)

std_npm_args unfortunately has a side-effect of requiring a package.json in the current directory:

brew/Library/Homebrew/language/node.rb

Line 34 in bdee21b

output = Utils.popen_read("npm", "pack", "--ignore-scripts")

[MikeMcQuaid]

This seems like a good temporary workaround @branchvincent but I'd like to see this re-added and the issue resolved another way.