Troopjs: remove count from clear completed button

Ref #1234

examples/troopjs_require/index.html

@@ -30,7 +30,7 @@
 					<a href="#/completed">Completed</a>
 				</li>
 			</ul>
-			<button id="clear-completed" data-weave="troopjs-todos/widget/clear">Clear completed (1)</button>
+			<button id="clear-completed" data-weave="troopjs-todos/widget/clear">Clear completed</button>
 		</footer>
 	</section>
 	<footer id="info">

examples/troopjs_require/js/widget/clear.js

@@ -13,7 +13,7 @@ define([
 		'hub:memory/todos/change': function onChange(items) {
 			var count = items.filter(filter).length;
 
-			this.$element.text('Clear completed (' + count + ')').toggle(count > 0);
+			this.$element.toggle(count > 0);
 		},
 
 		'dom/click': function onClear() {