fix: remove dropdown button margin

Author: lc-soft

src/ui/stylesheets/components/_navbar.scss

@@ -23,6 +23,10 @@
     background-color: $navbar-btn-bg-active;
   }
 
+  &:last-child {
+    margin-right: 0;
+  }
+
   &:disabled {
     color: $gray-600;
     background-color: transparent;