Fabian Homborg 5afd1336e8 functions/fish_npm_helper: Use physical pwd
This searched for package.json in any parent, so just like finding
.git and .hg directories it _needs_ to use the physical pwd because
that's what git/hg/yarn use.

In general, if you do _any_ logic on $PWD, it should be the physical
path. Logical $PWD is basically only good for display and cd-ing
around with symlinks.

[ci skip]
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