fix(tmux-sessionizer): unbound variable bug

modules/programs/tmux.nix

@@ -13,15 +13,15 @@ let
       options=$(fd -HIg '.git' ~/ --min-depth 1 --max-depth 5 --type d --prune --exec dirname {} | fzf --filter "''$*")
 
       if [[ -z $options ]]; then
-        return 1
+        exit 1
       elif [[ $(wc -l <<< "$options") -eq 1 ]]; then
         selected="$options"
       else
-        echo "$options" | fzf --query="$*"
+        selected=$(echo "$options" | fzf --query="$*")
       fi
 
       if [[ -z $selected ]]; then
-          exit 0
+        exit 0
       fi
 
       selected_name=$(basename "$selected" | tr . _)