bug#43405: Tool bar item doesn't align to the right edge

[Juri Linkov]

> Btw, are you trying this in a GTK build or with some other toolkit?

I tried both GTK and no-toolkit, and it can't align the icon to the right
on the tool-bar.

Whereas the same code nicely alights the icon on the tab-bar:

(progn
  (tab-bar-mode)
  (advice-add
   'tab-bar-make-keymap-1 :around
   (lambda (orig-fun)
     (append (funcall orig-fun)
             `((menu-bar
                menu-item
                ,(concat
                  (propertize " " 'display '(space :align-to (- right 5)))
                  (propertize " " 'display
                              '(image :type xpm
                                      :file "newsticker/narrow.xpm")))
                (lambda ()
                  (interactive)
                  (popup-menu (mouse-menu-bar-map)))))))
   '((name . tab-bar-menu-bar))))