theme: render tabs a bit better (no extra half-way border)

src/opnsense/www/themes/opnsense/build/css/main.css

@@ -3483,7 +3483,7 @@ tbody.collapse.in {
   .nav-tabs.nav-justified > .active > a:hover,
   .nav-tabs-justified > .active > a:focus,
   .nav-tabs.nav-justified > .active > a:focus {
-    border: 1px solid #ddd; }
+    border: 0px; }
   @media (min-width: 768px) {
     .nav-tabs-justified > li > a, .nav-tabs.nav-justified > li > a {
       border-bottom: 1px solid #ddd;