Get rid of undefined any? call on a boolean

Looks like these `any?` calls snuck in on c96f8d02492a49d4e87c73dae8c65a3d1820b10b.

AFAICT, all adapters just return `true` from the `clear()` method, which results in an undefined method exception:

```
     Failure/Error: subject.clear(feature).any?.should eq(true)
     NoMethodError:
       undefined method `any?' for true:TrueClass
```