Fix `browse-url-of-dired'

* lisp/net/browse-url.el (browse-url-emacs): Make the
`browse-url-of-dired' command work again after the browse-emacs
changes (bug#42429).
1 job for master in 65 minutes and 43 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Test
passed #8315
test-all

01:05:43