ENGCOM-3541: [Backport] Magento backend Notifications counter round icon small cut from right side #19356

 - Merge Pull Request #19356 from gelanivishal/magento2:2.2-develop-PR-port-19053
 - Merged commits:
   1. 132a754
   2. 91fc40c

Author: magento-engcom-team

app/design/adminhtml/Magento/backend/Magento_Backend/web/css/source/module/header/actions-group/_notifications.less

@@ -103,6 +103,8 @@
         padding: .3em .5em;
         position: absolute;
         top: 50%;
+        min-width: 18px;
+        height: 18px;
     }
 }