Tell CIDER to stay in same window when jumping to definitions

This restores the behaviour I like, which was as things were for a while.

See:
- clojure-emacs/cider#2757
- clojure-emacs/cider#2759

emacs-installation/emacs-init-files/nomis-clojure.el

@@ -55,6 +55,9 @@
     ;; Maybe a bug.
     (require 'cider-macroexpansion)))
 
+(setq cider-jump-to-pop-to-buffer-actions
+      '((display-buffer-same-window)))
+
 (require 'nomis-cider-extras)
 (require 'nomis-cider-extras-2)
 (require 'nomis-cider-eval-clj-and-cljs)