M2-2266: Fix action column submenu positioning

Author: strajeru

app/design/adminhtml/Magento/backend/Magento_Ui/web/css/source/module/_data-grid.less

@@ -304,7 +304,7 @@ body._in-resize {
         .action-menu {
             left: auto;
             min-width: 10rem;
-            right: 0;
+            right: auto;
             text-align: left;
             top: auto;
             z-index: 1;
@@ -435,7 +435,6 @@ body._in-resize {
     .data-grid-actions-cell {
         padding-left: @data-grid-cell__padding-horizontal * 2;
         padding-right: @data-grid-cell__padding-horizontal * 2;
-        position: relative;
         text-align: center;
         width: 1%;
     }