Describe the bug
When defining keyboard shortcuts in virtual console widgets, pgup and pgdown (and arrows) don't work.
It can be usefull to use a presenter remote as remote control in a theatre play.

To Reproduce
Steps to reproduce the behavior:

1. Go to 'Virtual Console'
2. Add a button, choose any function
3. In the button properties, choose a keyboard shortcup, press "Page Down" : PgDown key is selected
4. Switch to production mode
5. Press "Page Down"
6. See error

Expected behavior
PgUp and PgDown sould activate a function when selected as keyboard shortcut for this function in a virtual console widget.

Screenshots
If applicable, add screenshots to help explain your problem.

Desktop (please complete the following information):

• OS: Windows 10
• QLC+ Version 4.12.7

Additional context
Nothing