run eslint to fix most var instances

src/plugins/comicsPlayer/plugin.js

@@ -103,7 +103,7 @@ export class ComicsPlayer {
             const downloadUrl = apiClient.getItemDownloadUrl(item.Id);
             const archiveSource = new ArchiveSource(downloadUrl);
 
-            var instance = this;
+            const instance = this;
             import('swiper').then(({default: Swiper}) => {
                 archiveSource.load().then(() => {
                     loading.hide();

src/plugins/photoPlayer/plugin.js

@@ -10,11 +10,11 @@ export default class PhotoPlayer {
     play(options) {
         return new Promise(function (resolve, reject) {
             import('slideshow').then(({default: slideshow}) => {
-                var index = options.startIndex || 0;
+                const index = options.startIndex || 0;
 
-                var apiClient = window.connectionManager.currentApiClient();
+                const apiClient = window.connectionManager.currentApiClient();
                 apiClient.getCurrentUser().then(function(result) {
-                    var newSlideShow = new slideshow({
+                    const newSlideShow = new slideshow({
                         showTitle: false,
                         cover: false,
                         items: options.items,