home: tmux: fix OSC52 forwarding

I want neovim to be able to set my clipboard, and don't care for the
potential security issues of letting any program be able to do such a
thing.

home/tmux/default.nix

@@ -57,6 +57,9 @@ in
       }
       # Block selection in vim mode
       bind-key -Tcopy-mode-vi 'C-v' send -X begin-selection \; send -X rectangle-toggle
+
+      # Allow any application to send OSC52 escapes to set the clipboard
+      set -s set-clipboard on
     '';
   };
 }