Desktop: Fix viewer and panel plugins that check for the presence of exports fail to load (#10900)

packages/app-desktop/gui/note-viewer/index.html

@@ -46,9 +46,6 @@
 	<script src="./scrollmap.js"></script>
 
 	<script>
-	// Fixes a warning when loading some TypeScript plugins generated with webpack.
-	window.exports = {};
-
 	// This is function used internally to send message from the webview to
 	// the host.
 	const ipcProxySendToHost = (methodName, arg) => {

packages/app-desktop/services/plugins/UserWebviewIndex.js

@@ -2,9 +2,6 @@
 const webviewApiPromises_ = {};
 let viewMessageHandler_ = () => {};
 
-// This silences a warning when running plugins generated with Webpack.
-window.exports ??= {};
-
 // eslint-disable-next-line no-unused-vars, @typescript-eslint/no-unused-vars
 const webviewApi = {
 	postMessage: function(message) {