Ghostery Private Search is not added as an alternative search

[GRadziejewski]

Description
Ghostery Private Search is not added as an alternative search

Steps to Reproduce

1. Open Ghostery Private Browser

2. On the new tab, click Search engines (left upper corner)

3. Ghostery Private Search is missing
   

4. Open Settings/ Search/ Manage alternative search engines

5. Ghostery Private Search is not selected as the default one
   

Expected results:
Ghostery Private Search should be added as an alternative search engine.