[column view] Clicking back arrow should restore prev. folder structure

## What Happened

Currently if I burrow through a bunch of folders in column view and accidentally go to another unrelated dir by accident (like left-clicking a drive in the sidebar), pressing the back arrow/alt+←will just return me to the individual folder view rather than the previous tree.

## Expected Behavior

Files should retain up to 3 of the previous tree layouts, considering it already retains them when the app closes I can't imagine it is impossible to have some memory per open tab (it should really be the user's problem if they have too many tabs open)

## Steps to Reproduce

1. Open files
2. Navigate through a number of child folders in column view
3. Click on a location on the sidebar that isn't already open
4. Click the back arrow in the headerbar or use the key combo

## Platform Information

elementary OS Early Access, letest Files available from repos