lang/common-lisp: S-RET => newline-and-indent (REPL)

Suggested by @mfiano

modules/lang/common-lisp/config.el

@@ -63,6 +63,8 @@ bin/doom while packages at compile-time (not a runtime though)."
     (set-evil-initial-state!
       '(sly-db-mode sly-inspector-mode sly-popup-buffer-mode sly-xref-mode)
       'normal)
+    (evil-define-key 'insert sly-mrepl-mode-map
+      [S-return] #'newline-and-indent)
     (evil-define-key 'normal sly-parent-map
       (kbd "C-t") #'sly-pop-find-definition-stack)
     (evil-define-key 'normal sly-db-mode-map