use a global key binding for helm-org-rifle

Fixes #11420

CHANGELOG.develop

@@ -113,7 +113,7 @@ This file containes the change log for the next major version of Spacemacs.
     - ~SPC m C j~ to jump to current clock
     - ~SPC m C R~ to insert a clock report
 - Make =org-projectile= integration compatible with the newest version.
-- Add package =helm-org-rifle=, with keybinding ~SPC m r~ to rifle through
+- Add package =helm-org-rifle=, with keybinding ~SPC a o r~ to rifle through
   files.
 **** Scala
 - Move =ensime= to the =java= layer (Tor Hedin Bronner)

layers/+emacs/org/README.org

@@ -682,7 +682,7 @@ org-present must be activated explicitly by typing: ~SPC SPC org-present~
 
 | Key Binding | Description                                |
 |-------------+--------------------------------------------|
-| ~SPC m r~   | Search org files for keywords and headings |
+| ~SPC a o r~ | Search org files for keywords and headings |
 
 ** Org-projectile
 

layers/+emacs/org/packages.el

@@ -76,8 +76,7 @@
 (defun org/init-helm-org-rifle ()
   (use-package helm-org-rifle
     :defer t
-    :init (spacemacs/set-leader-keys-for-major-mode 'org-mode
-            "r" 'helm-org-rifle)))
+    :init (spacemacs/set-leader-keys "aor" 'helm-org-rifle)))
 
 (defun org/init-htmlize ()
   (use-package htmlize