org-agenda.el: Bind `^' to `org-agenda-filter-by-top-category'.

* org-agenda.el (org-agenda-mode-map): Bind `^' to
`org-agenda-filter-by-top-category'.

lisp/org-agenda.el

@@ -2076,6 +2076,7 @@ The following commands are available:
 (org-defkey org-agenda-mode-map "/" 'org-agenda-filter-by-tag)
 (org-defkey org-agenda-mode-map "\\" 'org-agenda-filter-by-tag-refine)
 (org-defkey org-agenda-mode-map "<" 'org-agenda-filter-by-category)
+(org-defkey org-agenda-mode-map "^" 'org-agenda-filter-by-top-category)
 (org-defkey org-agenda-mode-map ";" 'org-timer-set-timer)
 (define-key org-agenda-mode-map "?" 'org-agenda-show-the-flagging-note)
 (org-defkey org-agenda-mode-map "\C-c\C-x\C-mg"    'org-mobile-pull)