[O] Bug: org-icalendar converts org-icalendar-timezone to uppercase during export

[David Engster]

When exporting an Org file as iCalendar and org-icalendar-timezone is
set to e.g. "Europe/Berlin", it gets inserted as "EUROPE/BERLIN" during
export (and some CalDAV servers don't like that).

This is because "%Z" gets replaced with org-icalendar-timezone, and the
FIXEDCASE parameter isn't set in the call to
replace-regexp-in-string. The attached patch fixes that.

-David

diff --git a/lisp/org-icalendar.el b/lisp/org-icalendar.el
index 389dc5d..12cd058 100644
--- a/lisp/org-icalendar.el
+++ b/lisp/org-icalendar.el
@@ -677,7 +677,7 @@ a time), or the day by one (if it does not contain a time)."
       (setq fmt (if have-time
                    (replace-regexp-in-string "%Z"
                                              org-icalendar-timezone
-                                             org-icalendar-date-time-format)
+                                             org-icalendar-date-time-format t)
                  ";VALUE=DATE:%Y%m%d"))
       (concat keyword (format-time-string fmt time
                                          (and 
(org-icalendar-use-UTC-date-timep)