[clojure] Change leader key to fix warning

Fix this warning when reloading spacemacs configuration:

```
Error (use-package): cider/:init: Key sequence e p ; starts with non-prefix key e p
```

CHANGELOG.develop

@@ -1568,6 +1568,8 @@ Other:
     ~SPC m e p f~ 'cider-pprint-eval-defun-at-point
     ~SPC m e p e~ 'cider-pprint-eval-last-sexp
     (thanks to John Stevenson)
+  - Changed evaluation keybinding - cider-clojure-interaction-mode
+    ~SPC m e p l~ 'cider-eval-print-last-sexp
 - Fixes:
   - Removed =cider.nrepl/cider-middleware= in lein quick start setting
   - Fixed =cider-inspector-prev-page= binding, also add ~p~ as another key

layers/+lang/clojure/packages.el

@@ -222,7 +222,7 @@
       (spacemacs/set-leader-keys-for-major-mode 'cider-repl-mode
         "," 'cider-repl-handle-shortcut)
       (spacemacs/set-leader-keys-for-major-mode 'cider-clojure-interaction-mode
-        "ep" 'cider-eval-print-last-sexp))
+        "epl" 'cider-eval-print-last-sexp))
     :config
     (progn
       ;; add support for golden-ratio