Fix parent constructor has now changed in 2.3

Author: csdougliss

Block/Html/Topmenu.php

@@ -16,7 +16,7 @@ protected function _getHtml(
         \Magento\Framework\Data\Tree\Node $menuTree,
         $childrenWrapClass,
         $limit,
-        $colBrakes = []
+        array $colBrakes = []
     ) {
         $html = '';