Copy Subtree does not use data-udw-config.

Prereq.: Have e.g. 100 items with similar names.

Steps:

1. Set custom search limit for UDW in ezplatform-admin-ui/src/bundle/Resources/config/universal_discovery_widget.yml e.g. 77.
2. Go to Content / Content structure.
3. Select some content item in view mode which can be copied with Copy subtree.
4. Open Copy subtree.
5. Switch to Search tab.
6. Enter search phrase that covers all 100 items.

Expected result: Search results are limited to chosen value e.g. 77.
Actual result: Search results are limited to default hardcoded value (50).