Fix clock worker dependency path in module builds

[mindofmatthew]

The neocyclist clock worker import (added in 1.1.0) doesn't work in individually-published modules. When bundling those modules for publication, Vite transforms the clock worker import to the following, which is incorrect:

new SharedWorker(new URL("/assets/clockworker--4w5RvGG.js", import.meta.url))

It should be "./assets/..." so that it resolves relative to the package script, rather than the root url. This causes two separate issues:

• When used from a CDN, starting Strudel core works when started by default, but fails when started with { sync: true }, because it's trying to load the web worker from the root of the CDN (eg https://unpkg.com/assets/clockworker--4w5RvGG.js)
• Worse, this seems to completely prevent these packages from being used by another bundler if that bundler parses URL constructors during build in order to find worker dependencies. This causes a build failure in Parcel, at least, and I would imagine it similarly affects Vite and others.

This affects the @strudel/core package and the other two packages which re-package the core (@strudel/repl and @strudel/web). Specifying "./" as the base path for these packages solves the problem. Diffing the dist files verified that this change didn't have any other consequences for the build.

[mindofmatthew]

Since this is a regression, and a showstopper for including these packages with a bundler, it would be great if we could push this out as a v1.1.1 patch :crossed_fingers: