Favourite cities are not filtered when user reenters scene

[vandermesis]

Expected Behavior

When user entered text into searchbar text fileld in Favourite Cities scene tableview should show only cities containing given text.

Current Behavior

Tableview shows all cities fetched from API.

Failure Information

The problem appears only when user reenter Favourite Cities scene. When user enters scene for the first time and searchbar is empty everything seems to work ok.

Steps to Reproduce

1. On main screen click add
2. When on Favourite Cities scene enter some text into searchbar - it works fine
3. Go back to main scene
4. Reenter Favourite Cities - text you entered in 2 step should be still in searchbar text field, but tableview shows all cities from api instead filtered ones