fix copying from emacs to local clipboard

apparently with tmux 3.3 if you run emacs inside tmux locally on the
machine you need to enable passthrough. kinda weird?

see https://github.com/spudlyo/clipetty/issues/25#issuecomment-1327472790

.tmux.conf

@@ -12,11 +12,16 @@ bind s choose-tree -sZ -O name
 setw -g mode-keys vi
 bind / copy-mode \; send-key /
 bind ? copy-mode \; send-key ?
+bind -Tcopy-mode-vi 'v' send -X begin-selection
+bind -Tcopy-mode-vi 'y' send -X copy-pipe-and-cancel pbcopy
 
 bind r source-file ~/.tmux.conf \; display '~/.tmux.conf sourced'
 
+bind . attach-session -t . -c '#{pane_current_path}'
+
 set -g mouse on
 set -g allow-rename off
+set -g allow-passthrough on
 set -g history-limit 50000
 
 # Allow Spacemacs to correctly show colours