[FIX] mail: prevent hidden chat window close from opening home menu

opw-2210274

closes odoo/odoo#47245

X-original-commit: ca695425a2b06ffba15d7063fb0b8ea994f751d6
Signed-off-by: Alexandre Kühn (aku) <aku@odoo.com>

addons/mail/static/src/js/services/mail_window_manager.js

@@ -381,6 +381,7 @@ MailManager.include({
                     }
                 })
                 .on('click', '.o_thread_window_close', function (ev) {
+                    ev.preventDefault();
                     var threadID = $(ev.currentTarget).closest('.o_thread_window_header')
                                                       .data('thread-id');
                     var threadWindow = self._getHiddenThreadWindow(threadID);