Revert flex on vertical menu, no real need, and causing issues with ios

src/definitions/collections/menu.less

@@ -497,8 +497,7 @@ Floated Menu / Item
 ---------------*/
 
 .ui.vertical.menu {
-  display: inline-flex;
-  flex-direction: column;
+  display: block;
   background: @verticalBackground;
   box-shadow: @verticalBoxShadow;
 }
@@ -506,7 +505,6 @@ Floated Menu / Item
 /*--- Item ---*/
 .ui.vertical.menu .item {
   display: block;
-  align-self: stretch !important;
   background: @verticalItemBackground;
   border-top: none;
   border-right: none;