Wrong mode line window numbers with aw-ignore-current

[mattiasb]

When having aw-ignore-current and ace-window-display-mode both set to t
the numbers in the mode line aren't correct.

This becomes extra problematic when setting aw-display-mode-overlay to nil
with the intent of using only the mode line when chosing window.

Reproduce

1. Run M-x package-isolate.
2. Choose ace-window-0.10.0
3. Evaluate the following:

   (tool-bar-mode -1)
   (scroll-bar-mode -1)
   (menu-bar-mode -1)
   (load-theme 'wombat)
   
   (bind-key "M-'" #'ace-window)
   (setq   frame-title-format "")
   (setopt mode-line-format '("")
           aw-display-mode-overlay nil
           aw-ignore-current       t
           ace-window-display-mode t)
   (split-window-below)
   (split-window-right)
   

4. Note the numbers associated with the windows (1, 2 and 3).
5. Make sure you stand in the top-left window (1).
6. Press M-' 3 and get a No such candidate: 3, hit ‘C-g’ to quit. error.

Screenshot