AMBARI-17655. Redundant horizontal scrollbar on Versions tab (alexantonenko)

ambari-web/app/styles/stack_versions.less

@@ -146,7 +146,7 @@
 #stack-upgrade-page,
 .version-box-popup {
   .versions-slides {
-    overflow-x: scroll;
+    overflow-x: auto;
     padding-bottom: 25px;
     margin-left: 0;
     margin-top: 5px;