ox-koma-letter: Use same hotkeys as LaTeX export

  * ox-koma-letter.el (koma-letter): Use `L' to export to LaTeX
  buffer, `l' to export to LaTeX file, and `o' to export to PDF
  file and open.

Patch suggested by Rasmus.

Signed-off-by: Alan Schmitt <alan.schmitt@polytechnique.org>

contrib/lisp/ox-koma-letter.el

@@ -123,10 +123,10 @@
 		     (template . org-koma-letter-template))
   :menu-entry
   '(?k "Export with KOMA Scrlttr2"
-       ((?K "As LaTeX buffer" org-koma-letter-export-as-latex)
-	(?k "As LaTeX file" org-koma-letter-export-to-latex)
+       ((?L "As LaTeX buffer" org-koma-letter-export-as-latex)
+	(?l "As LaTeX file" org-koma-letter-export-to-latex)
 	(?p "As PDF file" org-koma-letter-export-to-pdf)
-	(?O "As PDF file and open"
+	(?o "As PDF file and open"
 	    (lambda (a s v b)
 	      (if a (org-koma-letter-export-to-pdf t s v b)
 		(org-open-file (org-koma-letter-export-to-pdf nil s v b))))))))