Show only the pwd from the prompt in the title

This works well together with Emacs Vterm to show the current working directory
in the mode-line.

fish/.config/fish/config.fish

@@ -1,6 +1,5 @@
 function fish_title
-    echo "$TERM:" (status current-command) ' '
+    prompt_pwd
-    pwd
 end
 
 function hc