Revert "org-do-emphasis-faces: Never treat closing marker as next opening marker"

This reverts commit fa315986a1.

The commit broke fontification of nested emphasis like
/italic *bold* more italic/.

lisp/org.el

@@ -5114,7 +5114,6 @@ stacked delimiters is N.  Escaping delimiters is not possible."
 				     '(invisible t))
 		(add-text-properties (match-beginning 3) (match-end 3)
 				     '(invisible t)))
-              (goto-char (match-end 0))
 	      (throw :exit t))))))))
 
 (defun org-emphasize (&optional char)