Zoning - editing a zone and setting zone type to hook zone only creates a new zone

[michael-cox]

Describe the bug
When using the in game zoning menu:

1. Select Edit Zones
2. Select a zone
3. Select Set zone type
4. Select Hook Zone
5. Choose any arbitrary trigger
6. Select Hook Zone again
7. Choose any arbitrary zone settings
8. Note that when listing zones, you will now have the original edited zones and a new hook zone that you created while "editing"

Expected behavior
The zone you are editing should be replaced with the new hook zone you configure after step 4

Screenshots

In the above gif, I edit zone Start-0 and Set Zone Type to a hook zone, proceeding through the rest of the hook zone options arbitrarily. At the end, you see that zone Start-0 still exists as well as a new zone Stage-3 created through the set zone type hook zone.