**Motivation**
Users can define a default namespace selection in the currrent namespace search UI. This selection should be used as default namespace selection when using the advanced search, too.
**Task**
Listen to what the backend gives you as namespaces that should be shown, and show them (equivalent to how the current namespace search box behaves)
**Acceptance Criteria**
- When the user goes onto SpecialSearch:Page, their default preferences are shown in the namespaces bar
- When a user is redirected from a search they submitted in the searchbox in the upper right corner, their default preferences are shown in the namespace par
- When the search is sent with a different set of namespaces, these ones are used (so a reload does not lead to suddenly changed namespaces)
- We don't change preferences
**Background**
The namespace selection can be found in mw.user.options.searchNs + number