Move get_post_types to form class

includes/widgets/class-displayfeaturedimagegenesis-widgets-form.php

@@ -26,6 +26,28 @@ class DisplayFeaturedImageGenesisWidgetsForm {
 		$this->instance = $instance;
 	}
 
+	/**
+	 * Get the public registered post types on the site.
+	 *
+	 * @return mixed
+	 */
+	public function get_post_types() {
+		$args       = array(
+			'public'      => true,
+			'_builtin'    => false,
+			'has_archive' => true,
+		);
+		$output     = 'objects';
+		$post_types = get_post_types( $args, $output );
+
+		$options['post'] = __( 'Posts', 'display-featured-image-genesis' );
+		foreach ( $post_types as $post_type ) {
+			$options[ $post_type->name ] = $post_type->label;
+		}
+
+		return $options;
+	}
+
 	/**
 	 * @return array
 	 */