I have the child theme activated, and I thought you had done the updates through that. Since you did not specify where and how you did your changes, I thought it went without saying.
Anyways, sorry for the confusion.
The shortcode is [do_widget “WooCommerce Currency Converter”]
If you could provide some info (on a private reply if it goes better with your guidelines) as to where this tweak is – whether it’s done on the ftp server or directly through WP database, I would have a better time doing the back up.
Hope all is well. See attached screenshot.