On Mac Cmd-§ is accepted and displays as Cmd-` for the en_GB_Mac keyboard layout

### Describe the issue you are having
In Preferences -> Shortcuts, if you hit Cmd-§ on a mac UK keyboard then even if you have selected the en_GB_Mac keyboard layout, the keystroke is described as as Cmd-\` in the keystroke box. However, it is Cmd-§ that is effective, not Cmd-\`.

This is probably true of other language mac keyboards.

### Paste the contents of Help → About (Shift+F1)
```
IDE:
Version: 4.4.3655
Platform: MacIntel
Date: 2021-11-24 08:08:49 +0100
Git commit: 322ef04cf1ad10c6202e16adaf0533851987072e
Preferences:{
"autoPW":"1",
"autocompletion":"off",
"doubleClickToEdit":"0",
"floatSingle":"0",
"floating":"1",
"ilf":"0",
"kbdLocale":"en_GB_Mac",
"keys":"{\"BT\":[\"Shift-Cmd-`\"],\"PRF\":[\"Cmd-,\"],\"TB\":[\"Cmd-`\"]}",
"lbar":"0",
"minimapRenderCharacters":"0",
"snippetSuggestions":"0",
"valueTips":"0",
"zoom":"-4"
}

Interpreter:
Version: 18.2.44885
Platform: Mac-64
Edition: Unicode/64
Date: Dec 2 2021 at 01:10:36
```