ENGCOM-1074: Backport: Fix for broken navigation menu on IE11 #14230 #14332

 - Merge Pull Request #14332 from sergiy-v/magento2:feature/2.1-fix-navigation-menu-on-ie11
 - Merged commits:
   1. acd6edd

Author: magento-engcom-team

lib/web/css/source/lib/_navigation.less

@@ -324,6 +324,7 @@
                 .lib-css(text-decoration, @_nav-level0-item-text-decoration);
                 box-sizing: border-box;
                 position: relative;
+                display: inline-block;
 
                 &:hover, &.ui-state-focus {
                     .lib-css(background, @_nav-level0-item-background-color-hover);