org-colview: Fix `org-agenda-overriding-columns-format'
* lisp/org-colview.el (org-columns--collect-values): Change signature.
(org-agenda-columns): Apply signature change.
When calling `org-agenda-columns' compiled columns format is set
locally to Agenda buffer, but `org-columns--collect-values' is called
from source buffers. Therefore, it uses default format instead of the
compiled one.
Reported-by: Christian Prothmann <ckprothmann@yahoo.com>
<http://permalink.gmane.org/gmane.emacs.orgmode/110748>