AMBARI-5258. Installer: 'Undo' button for repo BaseURL does not work. (onechiporenko)

ambari-web/app/controllers/installer.js

@@ -212,6 +212,7 @@ App.InstallerController = App.WizardController.extend({
                 oses.push({
                   osType: os.OperatingSystems.os_type,
                   baseUrl: latestBaseUrl,
+                  latestBaseUrl: latestBaseUrl,
                   originalLatestBaseUrl: latestBaseUrl,
                   originalBaseUrl: repo.Repositories.base_url,
                   defaultBaseUrl: defaultBaseUrl,

ambari-web/app/views/wizard/step1_view.js

@@ -240,6 +240,7 @@ App.WizardStep1View = Em.View.extend({
           os.validation = null;
           os.selected = false;
           targetGroup.set('baseUrl', os.latestBaseUrl);
+          targetGroup.set('latestBaseUrl', os.latestBaseUrl);
           targetGroup.set('undo', targetGroup.get('baseUrl') != targetGroup.get('defaultBaseUrl'));
           targetGroup.set('invalid-error', false);
           targetGroup.set('validation', null);