Fix stashed count

The variable `${git_dir}` was not available in the context of the
function `git-info`. It was only defined in the function `_git-action`.

modules/git/functions/git-info

@@ -95,6 +95,8 @@ function git-info {
   setopt LOCAL_OPTIONS
   setopt EXTENDED_GLOB
 
+  local git_dir="$(git-dir)"
+
   local action
   local action_format
   local action_formatted