Fixing key release event in Kitty event protocol with certain keyboard layouts

[tsacha]

What do you want to change?

I'd like to fix the issues raised in these discussions:

#12192
#12084
#12433

My proposed fix: tsacha@55ff7e4

Why do you want to make this change?

I'm using Neovim daily with Ergo-L keyboard layout, this issue is a real pain.

I suggested a small patch several month ago in #12192 and it is working quite well.

I acknowledge that:

• I have read the Contributing Guide and understand the contribution process.
• I have read and agree to follow the AI Usage Policy.
• I wrote this vouch request myself, in my own voice, without AI generating it.

[jcollie]

!vouch