fix: Bug when adding spaces to containers names in course outline

- Fixes the bug introduced in openedx#2732
- Removes the unnecessary `preventDefault`

Author: ChrisChV

src/course-outline/drag-helper/SortableItem.tsx

@@ -76,7 +76,6 @@ const SortableItem = ({
         if (!onClick) { return; }
 
         if (e.key === 'Enter' || e.key === ' ') {
-          e.preventDefault();
           onClick(e);
         }
       }}