fixed export of wiki history pages

git-svn-id: http://redmine.rubyforge.org/svn/branches/work@300 e93f8b46-1217-0410-a6f0-8f06a7374b81

wiki/app/views/wiki/show.rhtml

@@ -27,6 +27,6 @@
 
 <div class="contextual">
 <%= l(:label_export_to) %>
-<%= link_to 'HTML', {:export => 'html'}, :class => 'icon icon-html' %>,
-<%= link_to 'TXT', {:export => 'txt'}, :class => 'icon icon-txt' %>
+<%= link_to 'HTML', {:export => 'html', :version => @content.version}, :class => 'icon icon-html' %>,
+<%= link_to 'TXT', {:export => 'txt', :version => @content.version}, :class => 'icon icon-txt' %>
 </div>