The code to try to find the rollup configuration file iterates up

the directory tree until either the config is found or we hit the root.

Unfortunately, this was comparing a Path object (for the current path)

against str (for the root), which always evaluates to False. The

result was that if there's no rollup config, we'd end up infinitely

looping comparing Path('/') to /. This change fixes that.

Tried to load an extension which defined an index.ts file in its

bundles but did not have a rollup.config.js file. Saw that we no

longer hit the infinite loop.