add library scan button to dashboard

src/controllers/dashboard/dashboard.html

@@ -22,6 +22,9 @@
                         <button is="emby-button" type="button" id="btnShutdown" class="raised" onclick="DashboardPage.shutdown(this);">
                             <span>${ButtonShutdown}</span>
                         </button>
+                        <button is="emby-button" type="button" class="raised btnRefresh">
+                            <span>${ButtonScanAllLibraries}</span>
+                        </button>
                     </div>
 
                     <div style="margin-top: 2em;" class="runningTasksContainer hide">

src/controllers/dashboard/dashboard.js

@@ -3,6 +3,7 @@ import events from 'events';
 import itemHelper from 'itemHelper';
 import serverNotifications from 'serverNotifications';
 import dom from 'dom';
+import taskButton from 'scripts/taskbutton';
 import globalize from 'globalize';
 import * as datefns from 'date-fns';
 import dfnshelper from 'dfnshelper';
@@ -827,9 +828,17 @@ import 'emby-itemscontainer';
                 refreshActiveRecordings(view, apiClient);
                 loading.hide();
             }
+
+            taskButton({
+                mode: 'on',
+                taskKey: 'RefreshLibrary',
+                button: page.querySelector('.btnRefresh')
+            });
         });
         view.addEventListener('viewbeforehide', function () {
             const apiClient = ApiClient;
+            const page = this;
+
             events.off(serverNotifications, 'RestartRequired', onRestartRequired);
             events.off(serverNotifications, 'ServerShuttingDown', onServerShuttingDown);
             events.off(serverNotifications, 'ServerRestarting', onServerRestarting);
@@ -841,6 +850,12 @@ import 'emby-itemscontainer';
             if (apiClient) {
                 DashboardPage.stopInterval(apiClient);
             }
+
+            taskButton({
+                mode: 'off',
+                taskKey: 'RefreshLibrary',
+                button: page.querySelector('.btnRefresh')
+            });
         });
         view.addEventListener('viewdestroy', function () {
             const page = this;

src/scripts/taskbutton.js

@@ -13,7 +13,7 @@ export default function (options) {
 
     function updateTasks(tasks) {
         const task = tasks.filter(function (t) {
-            return t.ScheduledTask.Key == options.taskKey;
+            return t.Key == options.taskKey;
         })[0];
 
         if (options.panel) {