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();
       },
     });

test/clipboard.js

@@ -171,16 +171,16 @@ describe('Clipboard', () => {
   });
 
   describe('#clearSelection', () => {
-    it('should remove focus from target and text selection', (done) => {
+    it('should clear text selection without moving focus', (done) => {
       let clipboard = new Clipboard('.btn');
 
       clipboard.on('success', (e) => {
+        e.clearSelection();
+
         let selectedElem = document.activeElement;
         let selectedText = window.getSelection().toString();
 
-        e.clearSelection();
-
-        assert.equal(selectedElem, document.body);
+        assert.equal(selectedElem, e.trigger);
         assert.equal(selectedText, '');
 
         done();