Fix #805 don't blur() the trigger after a clipboard action (#807)

* Remove the `blur()` following a clipboard action

It's pointless to set `focus()` on the trigger first, if in the next step you're just going to `blur()` the active element anyway.

* Tweak test to not expect active element to be body

Since it's now not `blur()`ing anymore

* Fix test

see https://github.com/zenorocha/clipboard.js/pull/807#discussion_r862080076

src/clipboard.js

@@ -86,7 +86,6 @@ class Clipboard extends Emitter {
         if (trigger) {
           trigger.focus();
         }
-        document.activeElement.blur();
         window.getSelection().removeAllRanges();
       },
     });