bugfix: allow client to run in strict mode

[tylerchilds]

tested locally, this allows for the scripts to be included as esm with the least amount of friction:

import "http://localhost:8042/statebus.js"
import "http://localhost:8042/client-library.js"
import "http://unpkg.com/braidify/braidify-client.js"

window.braid_fetch = fetch

export const state = bus.state