[UDW] Allowed Content Types are not respected in object relation field

Allowed Content Types are not respected in object relation field.

Steps:

1. Create new CT with object relation field.
2. Set limitation on Allowed Content Types.
3. Create a new content item using this CT.
4. Try to select content items that are not allowed.

Actual result: It's possible to select all content types.
Expected result: Only content types that much the limitation can be selected.