Fix visibility in editor for non-public fields.

Author: iamdharmesh

includes/blocks/mailchimp-form-field/edit.js

@@ -286,7 +286,7 @@ export const MailchimpFormField = (props) => {
 
 	return (
 		<div
-			className={`mc_merge_var ${visible ? 'mailchimp_merge_field_visible' : 'mailchimp_merge_field_hidden'}`}
+			className={`mc_merge_var ${visible && field?.public ? 'mailchimp_merge_field_visible' : 'mailchimp_merge_field_hidden'}`}
 		>
 			<label htmlFor={tag} className={`mc_var_label mc_header mc_header_${type}`}>
 				<RichText
@@ -297,7 +297,7 @@ export const MailchimpFormField = (props) => {
 				/>
 				{required && showRequiredIndicator && <span className="mc_required">*</span>}
 			</label>
-			{!!visible && (
+			{!!visible && field?.public && (
 				<Disabled>
 					{renderInputField()}
 					{help_text && <span className="mc_help">{help_text}</span>}