Fix Unwanted Highlight in ManagedTable

Summary: Previously, rows got highlighted after switching between data for `ManagedTable` even though `highlightableRows` was set to false. This diff forces the highlighting not to happen when the value is set to false

Reviewed By: mweststrate

Differential Revision: D21720266

fbshipit-source-id: 534944fe03ad1561bc2109468ae6c4c5f3fc947d

desktop/app/src/ui/components/table/ManagedTable.tsx

@@ -402,6 +402,10 @@ export class ManagedTable extends React.Component<
   }
 
   onHighlight = (e: React.MouseEvent, row: TableBodyRow, index: number) => {
+    if (!this.props.highlightableRows) {
+      return;
+    }
+
     if (e.shiftKey) {
       // prevents text selection
       e.preventDefault();