Power Feed selector doesn't filter out feeds when Power Panel is selected

[benwa]

NetBox version

v3.3.5

Python version

3.8

Steps to Reproduce

1. Add two or more Power Panels
2. Add at least one Power Feed per Power Panel
3. Go to connect a new cable
4. Choose a Power Panel
5. When selecting a Power Feed, notice that feeds that are not apart of the previously selected panel are still showing

Expected Behavior

The list of feeds should be filtered by the Power Panel selected.

Observed Behavior

All feeds are shown (even at other sites).
This can be annoying at least, but at worst, if feeds are named the same, the wrong feed can be selected.