[MU4 Issue] New Shortcuts don't work

[BenignPigeon]

Describe the bug Upon changing the shortcut for the mixer from "F10" to "M" neither key is recognised

To Reproduce To reproduce the behaviour change the mixer shortcut to a different key

Expected behavior This new "M" key will act as a shortcut for the mixer

Platform information I am on Windows 10 on the 2nd alpha of musescore 4

Please look at the attached video for more information

https://user-images.githubusercontent.com/85837722/183755909-2f06dff4-df01-4ecc-a371-8d2bdb8694ef.mp4