Remove .init call from fullfat.ts (#372)

This has meant that `automerge-repo` couldn't even be _imported_ in an environment without access to `crypto.getRandomValues` (for example, outside the handler of a Cloudflare worker) because it needs to generate ids.

`init` is called correctly already any time a document is created or loaded, so this is only a bug fix and shouldn't have any other effects

packages/automerge-repo/src/entrypoints/fullfat.ts

@@ -7,5 +7,4 @@ export * from "../index.js"
 // disable
 //
 // eslint-disable-next-line automerge-slimport/enforce-automerge-slim-import
-import { next as Am } from "@automerge/automerge"
-Am.init()
+import "@automerge/automerge"