XWayland: allow snooping non-character keys with elevated snooping modes

These keys do not represent a security risk to allow apps to snoop since they can't be used to type passwords etc.

BUG: 474705 FIXED-IN: 6.0

Test plan

1. Set the snooping mode to the second or third setting in the KCM
2. Use Discord
3. Have a friend in Discord
4. Set your push-to-talk key in Discord to a non-character key like Shift or Home or F12
5. Start an audio or video chat with your friend (it's okay if they don't answer)
6. Alt+Tab to another window
7. Press your push-to-talk key

If it worked, you'll see a green circle around your avatar, indicating that your microphone is now recording.