html titles - respect WCAG SC 2.4.2

Author: cscheid

src/resources/formats/html/pandoc/metadata.html

@@ -20,4 +20,4 @@
 <meta name="description" content="$description-meta$" />
 $endif$
 
-<title>$if(title-prefix)$$title-prefix$ – $endif$$pagetitle$</title>
+<title>$pagetitle$$if(title-prefix)$ – $title-prefix$$endif$</title>