prerendered pages dont have relative path to css/js bundles

[tavelli]

steps to reproduce:

1. clone repo
2. "npm run build:prerender"

expected:
prerendered pages like /dist/browser/lazy/index.html should have relative path references to styles.css, runtime.js, etc.

actual:
all paths to css/js bundles seem to be same as root index.html file, which are just file name with no path.

example from lazy route prerender page:
/dist/browser/lazy/index.html
<link rel="stylesheet" href="styles.3ff695c00d717f2d2a11.css">
<script type="text/javascript" src="runtime.547b4c39066b2d16a666.js">