set dropdown-border-radius

src/client/styles/scss/_override-bootstrap-variables.scss

@@ -82,3 +82,7 @@ $nav-tabs-border-radius:          0;
 $navbar-padding-y:                0;
 $navbar-brand-padding-y:          0;
 $navbar-nav-link-padding-x:       1rem;
+
+
+// Dropdowns
+$dropdown-border-radius:          0;