Fix customization types of variables

Fix customization types of variables

* contrib/lisp/org-wl.el (org-wl-namazu-default-index): Fix custom type.
* lisp/ob-lob.el (org-babel-lob-files): Fix custom type.
* lisp/org-agenda.el (org-agenda-export-html-style):
(org-agenda-ndays):
(org-agenda-inactive-leader):
(org-agenda-day-face-function):
(org-agenda-auto-exclude-function): Fix custom type.
* lisp/org-bibtex.el (org-bibtex-prefix): Fix custom type.
* lisp/org-clock.el (org-clock-heading-function):
(org-show-notification-handler): Fix custom type.
* lisp/org-footnote.el (org-footnote-auto-adjust): Fix custom type.
* lisp/org-protocol.el (org-protocol-default-template-key): Fix custom type.
* lisp/org.el (org-make-link-description-function):
(org-link-translation-function):
(org-link-frame-setup):
(org-refile-target-verify-function):
(org-get-priority-function):
(org-use-fast-tag-selection):
(org-columns-modify-value-for-display-function):
(org-sparse-tree-default-date-type): Fix custom type.
* lisp/ox-html.el (org-html-postamble):
(org-html-postamble-format):
(org-html-preamble-format): Fix custom type.
* lisp/ox-odt.el (org-odt-content-template-file): Fix custom type.
* lisp/ox.el (org-export-with-archived-trees):
(org-export-initial-scope): Fix custom type.

Thanks to Glenn Moris for reporting these.  He used cus-test.el
to find them.