Fix incorrect width of sub menus in vertical menus

src/definitions/collections/menu.less

@@ -284,7 +284,7 @@
 }
 .ui.vertical.menu .dropdown.item .menu {
   left: 100%;
-  min-width: 0;
+  min-width: max-content;
   margin: 0em 0em 0em @dropdownMenuDistance;
   box-shadow: @dropdownVerticalMenuBoxShadow;
   border-radius: 0em @dropdownMenuBorderRadius @dropdownMenuBorderRadius @dropdownMenuBorderRadius;