Fix for right padding in dismissible alerts (#24481)

* Fix for right padding in dismissible alerts

* Removed extra whitespace

* Update _alert.scss

* Update _alert.scss

scss/_alert.scss

@@ -27,6 +27,8 @@
 // Expand the right padding and account for the close button's positioning.
 
 .alert-dismissible {
+  padding-right: ($close-font-size + $alert-padding-x * 2);
+
   // Adjust close link position
   .close {
     position: absolute;