Edit Selected in Wireless LANs overwrites Auth type and Auth cipher by default

[duckw]

NetBox version

v3.1.4

Python version

3.8

Steps to Reproduce

1. Click "Wireless" on the sidebar.
2. Click "Wireless LANs" on the sidebar.
3. Tick one or more Wireless LANs.
4. Click "Edit Selected".
5. Attempt to edit the Wireless LAN(s) without altering the value of Auth type and Auth cipher.

Expected Behavior

It is expected that there should not be a default value for either Auth type or Auth cipher and they should show --------- by default. The interface currently forces you to select a value.

Observed Behavior

Each of the selected Wireless LANs gets configured as Open / Auto assuming we were trying to alter a different attribute.