Remove the broken "User Dashboard" link.

Due to the lack of a </a>, this makes the entire header render badly.
Accordingly it's safe to assume noone is using it, so remove it.
With the new console template support, we'll need to something a bit
more nuanced later.

Change-Id: I3424bed6aea18cbd4c63ad48f98808098dadc3ad

web/web.go

@@ -141,11 +141,6 @@ func getTemplate(name string) (t *template.Template, err error) {
 		return
 	}
 
-	if *userAssetsPath != "" {
-		// replace "user_dashboard_link" template
-		t.Parse(`{{define "user_dashboard_link"}}<a href="/user">User Dashboard{{end}}`)
-	}
-
 	return
 }