latex template: Put header includes after title.

Closes pandoc#908.

default.latex

@@ -129,9 +129,6 @@ $if(lang)$
   \usepackage[$lang$]{babel}
 \fi
 $endif$
-$for(header-includes)$
-$header-includes$
-$endfor$
 
 $if(title)$
 \title{$title$}
@@ -141,6 +138,9 @@ $if(subtitle)$
 $endif$
 \author{$for(author)$$author$$sep$ \and $endfor$}
 \date{$date$}
+$for(header-includes)$
+$header-includes$
+$endfor$
 
 \begin{document}
 $if(title)$