[Bugfix] Fix Org key binding that jumps to previous heading

As it turns out, org-mode-map is a global map, not the map under C-c.

configuration.org

@@ -2454,7 +2454,7 @@ This is a big one; I use a lot of customisation here.
    ("C-c l" . org-toggle-link-display)
    ("C-a" . gpolonkai/move-to-beginning-of-line)
    ("C-e" . gpolonkai/move-to-end-of-line)
-   ("h" . outline-previous-heading)))
+   ("C-c h" . outline-previous-heading)))
 #+END_SRC
 
 ** Org bullets