Issue with unregistering hotkey that's already assigned to another overlay

[Zeffuro]

Steps to reproduce:

1. Assign a hotkey to any overlay (ALT-Z in my test case)
2. Apply changes.
3. Assign the same hotkey to another overlay (still ALT-Z).

Following errors show up: [12/03/2021 18:31:11] Error: Failed to unregister hotkey 5898241 in DisableHotKeys(). [12/03/2021 18:31:19] Error: Failed to unregister hotkey 5898241 in DisableHotKeys(). [12/03/2021 18:31:23] Error: Failed to unregister hotkey 5898241 in DisableHotKeys().

Thing to note is that the hotkey does work after reloading OverlayPlugin (or restarting ACT).