A field to change the Donate URL for the Donate button in the Thank you message is missing.

This was an available field in the previous version (cf https://github.com/greenpeace/planet4-plugin-gutenberg-blocks/blob/9789312297f56b8234bd7bacfac2882ba9c3717a/assets/src/blocks/ENForm/ENForm.js#L254-L259 , https://github.com/greenpeace/planet4-plugin-gutenberg-blocks/blob/9789312297f56b8234bd7bacfac2882ba9c3717a/assets/src/blocks/ENForm/ENFormBlock.js#L121-L125 )

This field should appear if the Donate button is shown, and disappear if it's hidden.