nodejs: use .finalPackage for ease of overriding

Previously, the nodejs `passthru.pkgs` attribute refers to the package
fixed point derived in the current context, without considering
potential overrides to the main nodejs package.

This is fixed here with the `.finalPackage` attribute, which refers to
the final package fixed point, after potential overrides.

For example, previously, after overriding nodejs with `nodejs.override`,
`nodejs.pkgs` would still refer to the original package, instead of the
overridden one. After this fix, `nodejs.pkgs` would be correctly based
on the overridden `nodejs` package.

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