Merge branch 'fix-dropdown' into 'master'

Remove not selector increasing specificity of rules

Closes #38958

See merge request gitlab-org/gitlab-ce!14789

app/assets/stylesheets/framework/dropdowns.scss

@@ -749,7 +749,7 @@
       margin-bottom: $dropdown-vertical-offset;
     }
-    li:not(.dropdown-bold-header) {
+    li {
       display: block;
       padding: 0 1px;

app/assets/stylesheets/framework/header.scss

@@ -161,9 +161,10 @@
     }
   }
-  .dropdown-bold-header {
+  li.dropdown-bold-header {
     color: $gl-text-color-secondary;
     font-size: 12px;
+    padding: 0 16px;
   }
   .navbar-collapse {