Fix for 404s on forms css

For all who have the bug where the contact forms, gravity forms and ninja forms asset css is not loading, change the following lines in class-db-elementor-form-admin.php to:
(78-80)

wp_enqueue_style( $this->plugin_name.'contact-form-7', plugin_dir_url( __FILE__ ) . 'assets/css/elementor-contact-form-7.css', array(), $this->version, 'all' );
		wp_enqueue_style( $this->plugin_name.'gravity-form', plugin_dir_url( __FILE__ ) . 'assets/css/elementor-gravity-form.css', array(), $this->version, 'all' );
		wp_enqueue_style( $this->plugin_name.'ninja-forms', plugin_dir_url( __FILE__ ) . 'assets/css/elementor-ninja-forms.css', array(), $this->version, 'all' );