do not wrap markdown title (#13421)

Author: cscheid

src/resources/pandoc/templates/default.markdown

@@ -1,5 +1,5 @@
 $if(title)$
-# $title$
+# $title/nowrap$
 $endif$
 $for(by-author)$$it.name.literal$$sep$, $endfor$
 $if(date)$