(list-faces-display): Provide button when describe-face

is called to take user back to  the list of faces.

lisp/faces.el

@@ -1184,6 +1184,7 @@ arg, prompt for a regular expression."
 	  (save-excursion
 	    (save-match-data
 	      (search-backward face-name)
+	      (setq help-xref-stack-item '(list-faces-display))
 	      (help-xref-button 0 'help-customize-face face)))
 	  (let ((beg (point))
 		(line-beg (line-beginning-position)))