Fix fields margin after new field for index module

engine/assets/cp.styles.css

@@ -1338,8 +1338,8 @@ div.wysiwyg.focused {
 		margin-bottom: 0px;
 	}
 
-	.data-form.index-add .form-group.n8,
-	.data-form.index-modify .form-group.n8 {
+	.data-form.index-add .form-group.n9,
+	.data-form.index-modify .form-group.n9 {
 		margin-bottom: 0px;
 	}