Fix overview spacing for disabled auto layout (#3291)

* Fix overlap in overview when config.disableLayout === true

* run gulp js
after commit 9193e5cd5d6d1aa234803b753c6d032b801a8221

---------

Co-authored-by: Hakim El Hattab <hakim.elhattab@gmail.com>

demo.html

@@ -471,6 +471,8 @@ Reveal.on( 'customevent', function() {
 				center: true,
 				hash: true,
 
+				// disableLayout: true,
+
 				// Learn about plugins: https://revealjs.com/plugins/
 				plugins: [ RevealZoom, RevealNotes, RevealSearch, RevealMarkdown, RevealHighlight ]
 			});