webview: fix user input

Fixes #7232

This commit reverts the breaking change of #7216 which
meant that users would not be able to provide keyboard input any
longer in a webview.

Signed-off-by: vince-fugnitto <vincent.fugnitto@ericsson.com>

packages/plugin-ext/src/main/browser/webview/pre/main.js

@@ -271,7 +271,6 @@
 		 * @param {KeyboardEvent} e
 		 */
         const handleInnerKeydown = (e) => {
-            e.preventDefault();
             host.postMessage('did-keydown', {
                 key: e.key,
                 keyCode: e.keyCode,