Participants filter retains previous adverb when resetting the filterset

When the filterset is cleared, it resets the overall filterset match type to 'Any', but the adverb also needs to be reset.

For example:

1. Open the participants page of a course with users.
2. Click 'Add condition', so there are 2 filter rows visible. You will correctly see an "OR" between the filter rows.
3. Change the filterset match type at the top of the form to "Match [All] of the following".
4. You will now see an "AND" between filter rows.
5. Click "Clear filters", then press "Add condition" again.
6. The filterset match type will be "Any", but you will still see "AND" between the 2 filter rows.