ENGCOM-4002: [Backport] update-button-issue-while-updating-billing-and-shipping-address #20685

Author: sidolov

app/design/frontend/Magento/blank/web/css/source/_forms.less

@@ -18,7 +18,7 @@
     .fieldset {
         .lib-form-fieldset();
         &:last-child {
-            margin-bottom: 0;
+            margin-bottom: @indent__base;
         }
 
         > .field,

app/design/frontend/Magento/luma/web/css/source/_forms.less

@@ -20,7 +20,7 @@
         .lib-form-fieldset();
 
         &:last-child {
-            margin-bottom: 0;
+            margin-bottom: @indent__base;
         }
 
         > .field,