dashboard/app: fix anchors for namespaces

The human readable caption is a bad value for anchor,
also potentially changing over time.
Restore the namespace name as anchor as it should be.

dashboard/app/main.go

@@ -77,6 +77,7 @@ type uiBugPage struct {
 }
 
 type uiBugNamespace struct {
+	Name       string
 	Caption    string
 	CoverLink  string
 	FixedLink  string
@@ -422,9 +423,11 @@ func fetchNamespaceBugs(c context.Context, accessLevel AccessLevel, ns string,
 	if !onlyFixed {
 		fixedLink = fmt.Sprintf("?fixed=%v", ns)
 	}
+	cfg := config.Namespaces[ns]
 	uiNamespace := &uiBugNamespace{
-		Caption:    config.Namespaces[ns].DisplayTitle,
-		CoverLink:  config.Namespaces[ns].CoverLink,
+		Name:       ns,
+		Caption:    cfg.DisplayTitle,
+		CoverLink:  cfg.CoverLink,
 		FixedCount: fixedCount,
 		FixedLink:  fixedLink,
 		Groups:     uiGroups,

dashboard/app/main.html

@@ -111,7 +111,7 @@ Main page.
 
 	{{range $ns := $.BugNamespaces}}
 		<br>
-		<h2 id="{{$ns.Caption}}">{{$ns.Caption}}</h2>
+		<h2 id="{{$ns.Name}}">{{$ns.Caption}}</h2>
 		{{if $ns.FixedLink}}
 			{{if $ns.CoverLink}}
 				<a href="{{$ns.CoverLink}}" target="_blank">source coverage</a> |