[FIX] mail: odoo shortcuts doesn't work if chat window is focused

Before this commit:

When chat window is focused odoo shortcuts (with alt) did not work because of
there is stop propagation in _onKeydown method.

After this commit:

Remove stop propagation. Now odoo shortcuts (with alt) work
properly.

Task-2388829

closes odoo/odoo#66280

X-original-commit: 1de3ce47c6ab1a7afaccfda086a6284c0c41dcf3
Signed-off-by: Sébastien Theys (seb) <seb@odoo.com>

addons/mail/static/src/components/chat_window/chat_window.js

@@ -289,12 +289,6 @@ class ChatWindow extends Component {
      * @param {KeyboardEvent} ev
      */
     _onKeydown(ev) {
-        /**
-         * Prevent auto-focus of fuzzy search in the home menu.
-         * Useful in order to allow copy/paste content inside chat window with
-         * CTRL-C & CTRL-V when on the home menu.
-         */
-        ev.stopPropagation();
         if (!this.chatWindow) {
             // prevent crash during delete
             return;