fix(menu): stretch menu list container to fit all items (#5589)

Author: robert-hebel-sb

src/standalone/styles/topbar.less

@@ -47,7 +47,7 @@
     flex-wrap: wrap;
     max-width: 800px;
     .dd-menu-items {
-      width: 700px;
+      width: max-content;
       .dd-items-left {
         display: flex;
         flex-direction: column;

src/styles/_dropdown-menu.less

@@ -428,7 +428,7 @@
     max-width: 800px;
 
     .dd-menu-items {
-      width: 700px;
+      width: max-content;
 
       .dd-items-left {
         display: flex;