Add missing empty space to print out valid HTML. (#59255)

Unlinked contributors: gyurmey2.

Co-authored-by: juanfra <juanfra@git.wordpress.org>
Co-authored-by: Mamaduka <mamaduka@git.wordpress.org>
Co-authored-by: huzaifaalmesbah <huzaifaalmesbah@git.wordpress.org>

packages/block-library/src/navigation/index.php

@@ -561,7 +561,7 @@ private static function get_nav_element_directives( $is_interactive ) {
 			)
 		);
 		$nav_element_directives = '
-		 data-wp-interactive="core/navigation"'
+		 data-wp-interactive="core/navigation" '
 		. $nav_element_context;
 
 		return $nav_element_directives;