Deleting a virtual Chassis with members does not set the device member position to None

[arthanson]

NetBox Edition

NetBox Community

NetBox Version

v4.4.5

Python Version

3.10

Steps to Reproduce

1. Create a device MD1
2. create a virtual chassis
3. Add a new member (MD1) to the virtual chassis at position 1
4. Delete the virtual chassis

Expected Behavior

The device vc_position should be set to None

Observed Behavior

The device vc_position is still set to 1. This causes the ObjectChange to be recorded wrong and can result in errors in branching when doing a sync. See branching issue #170