Merge branch 'bvl-fix-terms-top-margin-ee' into 'master'

[EE] Remove top margin on the terms page with performance bar

See merge request gitlab-org/gitlab-ee!5579

app/assets/stylesheets/framework/terms.scss

 .terms {
+  .with-performance-bar & {
+    margin-top: 0;
+  }
+
   .alert-wrapper {
     min-height: $header-height + $gl-padding;
   }

ee/app/assets/stylesheets/framework/terms.scss

 .terms {
-  .with-system-header & {
+  .with-system-header &,
+  .with-system-header.with-performance-bar & {
     margin-top: 0;
   }
 }