npm / cli / #2396

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fix(npx): use proper cache param

The `flatOptions` cache is the one that is intended to be passed down
into other modules, as it has the `_cacache` suffix attached.  What was
happening before was that `npx` was creating a new alternate cache one
directory up from where everything else was, and also putting the `_npx`
content there.  It is possible this is the source of at least some of
our "npx doesn't find the right versions" bugs.

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