[FIX] im_livechat: add missing dependency to livechat widget

Bug
===
A dependecy is missing "lazyloader.js"

Task #2118959
opw-2188615

closes odoo/odoo#39763

Signed-off-by: Nicolas Martinelli (nim) <nim@odoo.com>

addons/im_livechat/views/im_livechat_channel_templates.xml

@@ -151,6 +151,7 @@
             <script type="text/javascript" src="/web/static/src/js/core/local_storage.js"></script>
             <script type="text/javascript" src="/web/static/src/js/core/ram_storage.js"></script>
             <script type="text/javascript" src="/web/static/src/js/core/abstract_storage_service.js"></script>
+            <script type="text/javascript" src="/web/static/src/js/public/lazyloader.js"/>
             <script type="text/javascript" src="/web/static/src/js/public/public_root.js"/>
             <script type="text/javascript" src="/web/static/src/js/public/public_root_instance.js"/>
             <script type="text/javascript" src="/web/static/src/js/public/public_widget.js"/>