LaTeX export: Fix a variable definition

lisp/ChangeLog

@@ -1,5 +1,8 @@
 2009-05-21  Carsten Dominik  <carsten.dominik@gmail.com>
 
+	* org-latex.el (org-export-latex-low-levels): Fix customization
+	type.
+
 	* org.el (org-priority, org-shiftup, org-shiftdown): Disable
 	priority commands.
 

lisp/org-latex.el

@@ -260,9 +260,9 @@ a string to be used instead of \\section{%s}.  In this latter case,
 the %s stands here for the inserted headline and is mandatory."
   :group 'org-export-latex
   :type '(choice (const :tag "Ignore" nil)
-		 (symbol :tag "Convert as descriptive list" description)
-		 (symbol :tag "Convert as itemized list" itemize)
-		 (symbol :tag "Convert as enumerated list" enumerate)
+		 (const :tag "Convert as descriptive list" description)
+		 (const :tag "Convert as itemized list" itemize)
+		 (const :tag "Convert as enumerated list" enumerate)
 		 (string :tag "Use a section string" :value "\\subparagraph{%s}")))
 
 (defcustom org-export-latex-list-parameters