Word List: new list not blank

[ajdapretnar]

Describe the bug
When creating a new, second list in the Word List widget, the list is not blank. Instead, it is a copy of the previous one. Possibly, when having many lists, the below options Intersection and Union might be enabled, too.

To Reproduce
Steps to reproduce the behavior:

1. Open Word List.
2. Create a list (i.e. "foo", "bar").
3. Create a second list. It is not blank.

Expected behavior
A new list should be blank.

Orange version:
3.37.dev

Text add-on version:
1.16.0dev

Screenshots

Operating system:
OSX

[ajdapretnar]

Fixed in #1052.