Zoekt search should work independently of Advanced Search

Summary

Currently, if you disable Advanced Search, Zoekt stops working and falls back to Basic Search.

Steps to reproduce

1. Enable Zoekt in GDK
2. Search Code in Zoekt-enabled namespace
3. Disable Advanced search (Search with Elasticsearch enabled, Elasticsearch indexing)
4. Repeat the search

What is the current bug behavior?

What is the expected correct behavior?

Relevant logs and/or screenshots

Before

After

Possible fixes