ui: fix sticky header

Author: undefined-moe

packages/ui-default/misc/structure.styl

@@ -153,6 +153,3 @@ html
 
 .flex-cross-stretch
   align-items: stretch
-  
-.overflow-hidden-horizontal
-  overflow-x: hidden

packages/ui-default/templates/partials/scoreboard.html

@@ -18,7 +18,7 @@
       </blockquote>
     </div>
   {% endif %}
-  <div class="section__body no-padding overflow-hidden-horizontal">
+  <div class="section__body no-padding">
     <table class="data-table">
       <colgroup>
       {%- for column in rows[0] -%}