Follow-up liveLinkStore first fetch with regular fetch immediately

I don't have permissions to make a pull request, but I would suggest something like this on main-0.5 in packages/stores/src/holochain.ts:485

```
const fetch = async () => {
if (!active) return;
if (isFirstFetch) {
isFirstFetch = false
const firstLinks = await firstFetchLinks();
maybeSet(firstLinks);
}
const nlinks = await fetchLinks().finally(() => {
if (active) {
setTimeout(() => fetch(), pollIntervalMs);
}
});
maybeSet(nlinks);
};
```

This would allow an immediate network call followup after a local fetch, to remove unnecessary waiting time for network data.