Allows sending messages with MacOS window-mode

[will-clarke]

I've no idea if this actually works / breaks other OS flows / with a different setup, but this works for me ¯_(ツ)_/¯

[will-clarke]

Hah. I didn't mean to open this PR here - I was just mucking around locally.

Since this fixes an issue on my computer - it now Works On My Machine ™️ - it may be worth looking into a better solution (or even merging this in if it's a real issue that other people face).

One other thing that may be worth changing here - we could improve the README to say that we should have something like

allow_remote_control yes
listen_on unix:/tmp/kitty

in our ~/.config/kitty/kitty.conf ¯_(ツ)_/¯