[org] Enable SPC a o / key binding whenever helm-org-rifle not used

This enables the key binding when the completion layer is compleseus,
for example.

layers/+emacs/org/packages.el

@@ -399,7 +399,9 @@ Will work on both org-mode and any mode that accepts plain html."
       "aof" "feeds"
       "aoC" (org-clocks-prefix))
     ;; org-agenda
-    (when (configuration-layer/layer-used-p 'ivy)
+    (unless (when-let ((pkg (configuration-layer/get-package 'helm-org-rifle)))
+              ;; `configuration-layer/package-used-p' doesn't check :toggle status
+              (cfgl-package-used-p pkg))
       (spacemacs/set-leader-keys "ao/" 'org-occur-in-agenda-files))
     (spacemacs/set-leader-keys
       "ao#" 'org-agenda-list-stuck-projects