fix: clear_messages_on_reconnection to false sib-app#412

sib-chat.js

@@ -194,7 +194,7 @@ export const SibChat = {
       'auto_reconnect': true,
       'auto_register_muc_nickname': true,
       'bosh_service_url': this.element.dataset.boshServiceUrl,
-      "clear_messages_on_reconnection": true,
+      "clear_messages_on_reconnection": false,
       'i18n': 'en',
       'jid': jabberID.toLowerCase(),
       'locales_url': this.element.dataset.localesUrl,