[nextcloud] Embed login view into window

Instead of opening it in a separate window embed it into the existing one as one step of the wizard.

plugins/nextcloud-ui/package/contents/ui/WebLogin.qml

+/*
+ *   Copyright 2019 (C) Rituka Patwal <ritukapatwal21@gmail.com>
+ *   Copyright 2015 (C) Martin Klapetek <mklapetek@kde.org>
+ *
+ *   SPDX-License-Identifier: LGPL-2.0-or-later
+ */
+
+import QtQuick 2.2
+import QtQuick.Layouts 1.12
+import QtQuick.Controls 2.5
+import QtWebEngine 1.10
+
+import org.kde.kirigami 2.5 as Kirigami
+
+WebEngineView {
+    url: helper.loginUrl
+    profile: helper.webengineProfile
+}

plugins/nextcloud-ui/package/contents/ui/main.qml

@@ -34,7 +34,7 @@ Kirigami.ApplicationWindow {
                         case NextcloudController.ServerUrl:
                             return Qt.resolvedUrl("Server.qml");
                         case NextcloudController.WebLogin:
-                            return ""
+                            return Qt.resolvedUrl("WebLogin.qml")
                         case NextcloudController.Services:
                             return Qt.resolvedUrl("Services.qml")
                     }