services/debug/debug/debugbrowser: use relative paths for log file links.

Change-Id: I21c975e7c8f40bbb7aa47c55da589dd7ba269f12
diff --git a/services/debug/debug/browseserver/browseserver.go b/services/debug/debug/browseserver/browseserver.go
index 18761a6..7f63607 100644
--- a/services/debug/debug/browseserver/browseserver.go
+++ b/services/debug/debug/browseserver/browseserver.go
@@ -373,7 +373,7 @@
 		log    = r.FormValue("l")
 		prefix = naming.Join(server, "__debug", "logs")
 		name   = naming.Join(prefix, log)
-		path   = r.URL.Path
+		path   = strings.TrimPrefix(r.URL.Path, "/")
 		list   = func() bool {
 			for _, a := range r.Header[http.CanonicalHeaderKey("Accept")] {
 				if a == "text/event-stream" {