[FIX] im_livechat: noupdate around default livechat channel

Before this update if you would update the module the default livechat details would be reset.
By wrapping it in a no-update they're not updated with a module update.

closes odoo/odoo#69961

Signed-off-by: Sébastien Theys (seb) <seb@odoo.com>

addons/im_livechat/data/im_livechat_channel_data.xml

 <?xml version="1.0"?>
 <odoo>
-    <data>
+    <data noupdate="1">
         <record id="im_livechat_channel_data" model="im_livechat.channel">
             <field name="name">YourWebsite.com</field>
             <field name="default_message">Hello, how may I help you?</field>