mod_conversejs: Make PWA options match documentation Keeps fallback to `name` because this is a common option used by e.g. mod_disco to give a descriptive name for the server itself, which seems a sensible default.

This module blocks configured queries that change server state.

E.g. to make vCard storage read-only:

``` lua
readonly_stores = {
	vcard = { "vcard-temp", "vCard" };
}
```