Remove duplicate keybinding (#3719)

This keybinding was first introduced in the commit[1].  There are two
lines of keybindings to `C-c C-q`, probably due to a simple
mistake.

[1]: 6a9bc1c

CHANGELOG.md

@@ -8,6 +8,7 @@
 
 - [#3714](https://github.com/clojure-emacs/cider/pull/3714): Show progress when evaluating files using `cider-load-all-files`.
 - [#3713](https://github.com/clojure-emacs/cider/pull/3713): Optimize `nrepl-dict-get` and deprecate its 3-argument arity.
+- [#3719](https://github.com/clojure-emacs/cider/pull/3719): Clean duplicate define-key
 
 ### Bugs fixed
 

cider-connection.el

@@ -631,7 +631,6 @@ REPL defaults to the current REPL."
     (define-key map (kbd "j d") #'cider-describe-connection)
     (define-key map (kbd "j i") #'cider-describe-connection)
     (define-key map (kbd "C-c C-q") #'cider-quit)
-    (define-key map (kbd "C-c C-q") #'cider-quit)
     (define-key map (kbd "C-c C-r") #'cider-restart)
     (define-key map (kbd "C-c M-r") #'cider-restart)
     (define-key map (kbd "C-c C-d") #'cider-describe-connection)