MOBILE-3039 core: Fix load logged out site with SSO

src/core/login/providers/helper.ts

@@ -938,6 +938,8 @@ export class CoreLoginHelperProvider {
 
                     promise.then(() => {
                         this.waitingForBrowser = true;
+                        this.sitesProvider.unsetCurrentSite(); // We need to unset current site to make authentication work fine.
+
                         this.openBrowserForSSOLogin(result.siteUrl, result.code, result.service,
                             result.config && result.config.launchurl, data.pageName, data.params);
                     }).catch(() => {

src/providers/sites.ts

@@ -1181,6 +1181,13 @@ export class CoreSitesProvider {
         });
     }
 
+    /**
+     * Unset current site.
+     */
+    unsetCurrentSite(): void {
+        this.currentSite = undefined;
+    }
+
     /**
      * Updates a site's token.
      *