gitweb: wrap table rows of annotate view into a <tbody> element

We will use this element to hook data attribute for the followlines.js script
to be plugged in annotate view. Also this gets symmetrical with paper style
which already has a <tbody> element.

mercurial/templates/gitweb/fileannotate.tmpl

@@ -66,7 +66,9 b' annotate |'
 </div>
 <div class="page_body">
 <table>
+<tbody>
 {annotate%annotateline}
+</tbody>
 </table>
 </div>