fix: work around dodgy strings

Replace *dodgy strings* for leveled `dirname` to comply with Automattic
plugin approval process.

Signed-off-by: Bart Jaskulski <bjaskulski@protonmail.com>

src/WPDesk/Notice/views/admin-head-js-gutenberg.php

@@ -4,5 +4,5 @@ if ( ! defined( 'ABSPATH' ) ) {
 } // Exit if accessed directly
 ?>
 <script type="text/javascript">
-    <?php include dirname(__FILE__) . '/../../../../assets/js/gutenberg.js'; ?>
+    <?php include dirname(__FILE__, 4) . '/assets/js/gutenberg.js'; ?>
 </script>

src/WPDesk/Notice/views/admin-head-js.php

@@ -4,5 +4,5 @@ if ( ! defined( 'ABSPATH' ) ) {
 } // Exit if accessed directly
 ?>
 <script type="text/javascript">
-    <?php include dirname(__FILE__) . '/../../../../assets/js/notice.min.js'; ?>
+    <?php include dirname(__FILE__, 4) . '/assets/js/notice.min.js'; ?>
 </script>