made dropdown content scroll

Created by: RobinJespersen

If the "Frequently visited" list needs more space than the given, its content is now scrollable. This only affects the "Frequently visited" not the search results.

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app/assets/stylesheets/framework/dropdowns.scss

@@ -916,6 +916,7 @@ header.header-content .dropdown-menu.projects-dropdown-menu {
   .project-dropdown-content {
     position: relative;
     width: 70%;
+    overflow: scroll;
   }
   @media (max-width: $screen-xs-max) {