fix failing test

test/test-multiple-instances.html

@@ -42,7 +42,7 @@
 			QUnit.module( 'Multiple reveal.js instances' );
 
 			let r1 = new Reveal( document.querySelector( '.deck1 .reveal' ), {
-				embedded: true
+				embedded: true,
 				keyboard: true
 			} );
 			r1.initialize();