Private rather than public class

- Make our two new helper methods private rather than public
- Change the missing-license notice attribute to `wpjm_missing_license_notice_`

includes/helper/class-wp-job-manager-helper.php

@@ -919,7 +919,7 @@ private function handle_product_activation_response( $response, $product_slug, $
 	 * @param array  $plugin_data The plugin data.
 	 * @return array
 	 */
-	public function add_missing_license_notice( $notices, $product_slug, $plugin_data ) {
+	private function add_missing_license_notice( $notices, $product_slug, $plugin_data ) {
 		$notice = [
 			'level'       => 'info',
 			'dismissible' => true,
@@ -938,7 +938,7 @@ public function add_missing_license_notice( $notices, $product_slug, $plugin_dat
 				esc_html( $plugin_data['Name'] )
 			),
 		];
-		$notices[ 'wpjm_licence_notice_' . $product_slug ] = $notice;
+		$notices[ 'wpjm_missing_license_notice_' . $product_slug ] = $notice;
 
 		return $notices;
 	}
@@ -951,7 +951,7 @@ public function add_missing_license_notice( $notices, $product_slug, $plugin_dat
 	 * @param array  $plugin_data The plugin data.
 	 * @return array
 	 */
-	public function add_error_license_notice( $notices, $product_slug, $plugin_data ) {
+	private function add_error_license_notice( $notices, $product_slug, $plugin_data ) {
 		$notice = [
 			'level'       => 'error',
 			'dismissible' => true,
@@ -970,7 +970,7 @@ public function add_error_license_notice( $notices, $product_slug, $plugin_data
 				esc_url( admin_url( 'edit.php?post_type=job_listing&page=job-manager-addons&section=helper#' . sanitize_title( $product_slug . '_row' ) ) )
 			),
 		];
-		$notices[ 'wpjm_licence_error_notice_' . $product_slug ] = $notice;
+		$notices[ 'wpjm_license_error_notice_' . $product_slug ] = $notice;
 
 		return $notices;
 	}