gitweb: blame table row no highlight fix

Until now blame just used the commit/tree/tags/etc style of
highlight-able table rows, which have alternating light/dark rows that
flash when mouse pointer passes over them. This is very annoying in
blame, since the text is static and it interferes with the
per-revision block highlighting.

Signed-off-by: Luben Tuikov <ltuikov@yahoo.com>
Signed-off-by: Junio C Hamano <junkio@cox.net>

gitweb/gitweb.css

@@ -171,6 +171,10 @@ tr.dark {
 	background-color: #f6f6f0;
 }
 
+tr.dark2 {
+	background-color: #f6f6f0;
+}
+
 tr.dark:hover {
 	background-color: #edece6;
 }