Set revert-buffer-function in ert-results-mode

* lisp/emacs-lisp/ert.el (ert-results-mode): Set revert-buffer-function
to re-run the same test selection.  It is a good fit and permits use of
the standard "g" key binding.
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Status Job ID Name Coverage
  Test
failed #2595
test-all

 
Name Stage Failure
failed
test-all Test There has been a timeout failure or the job got stuck. Check your timeout limits or try again
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