Backspace binding doesn't work in Windows 10

[willthong]

Describe the bug When bound, backspace still outputs backspace rather than the bound key

To Reproduce

Steps to reproduce the behavior:

1. In the Machine tab of Configuration, bind BackSpace to A-
2. Enable Output

Expected behavior

BackSpace should output A-; instead, it deletes the previous character.

Operating system

• OS: Windows 10
• Plover Version 4.0.0.dev10

Hardware

Tested on two QWERTY keyboards, a standard Dell and a Ferris Sweep split keyboard.

Thanks for any help you can provide!