Bug#1063237: tmux: crash when pasting into dead pane

[Romain Francoise]

Fix merged upstream:

https://github.com/tmux/tmux/commit/4bdb855020d266ea0a480a53e13c806fcaad9b45

And tmux 3.4 is also out, so it'll be part of that upload.

Thanks,
-- 
Romain Francoise <rfranco...@debian.org>
https://people.debian.org/~rfrancoise/