fix broken backwards navigation in rtl mode

dist/reveal.css

@@ -1,5 +1,5 @@
 /*!
-* reveal.js 5.0.4
+* reveal.js 5.0.5
 * https://revealjs.com
 * MIT licensed
 *

js/reveal.js

@@ -2629,9 +2629,6 @@ export default function( revealElement, options ) {
 			if( routes.down ) {
 				navigateDown({skipFragments});
 			}
-			else if( config.rtl ) {
-				navigateLeft({skipFragments});
-			}
 			else {
 				navigateRight({skipFragments});
 			}