bug accessing stored decoded request

[benmccann]

@hannoeru suggested in vitejs/vite#4728 (comment) that he found a bug here:

sirv/packages/sirv/index.js

Line 163 in 83ee458

let pathname = !!req._decoded && req.path || parse(req, true).pathname;

I think perhaps that line should change to the following?

let pathname = !!req._decoded && req._parsedUrl.pathname || parse(req, true).pathname;