ui: Fix up typo for the UI config template url (#9109)

ui/packages/consul-ui/app/routes/dc/services/show.js

@@ -16,7 +16,7 @@ export default Route.extend({
       items: this.data.source(
         uri => uri`/${nspace}/${dc}/service-instances/for-service/${params.name}`
       ),
-      urls: this.config.get().dashboard_url_template,
+      urls: this.config.get().dashboard_url_templates,
       chain: null,
       proxies: [],
       topology: null,

ui/packages/consul-ui/lib/startup/templates/head.html.js

@@ -7,7 +7,7 @@ module.exports = ({ appName, environment, rootURL, config }) => `
           JSON.stringify({
             metrics_provider: 'prometheus',
             metrics_proxy_enabled: true,
-            dashboard_url_template: {
+            dashboard_url_templates: {
               service: 'https://example.com?{{Service.Name}}&{{Datacenter}}',
             },
           })