mod_http_oauth2: Fix appending of query parts in error redirects Looks like this meant to check whether the redirect_uri has a ?query part, but forgot to inspect the field for this in the returned table.

This module blocks configured queries that change server state.

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

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