demo(typeahead): correct demo for asyn results

Fixes #1740

src/typeahead/docs/demo.html

@@ -12,7 +12,7 @@ <h4>Static arrays</h4>
 
     <h4>Asynchronous results</h4>
     <pre>Model: {{asyncSelected | json}}</pre>
-    <input type="text" ng-model="asyncSelected" placeholder="Locations loaded via $http" typeahead="address for address in getLocation($viewValue) | filter:$viewValue" typeahead-loading="loadingLocations" class="form-control">
+    <input type="text" ng-model="asyncSelected" placeholder="Locations loaded via $http" typeahead="address for address in getLocation($viewValue)" typeahead-loading="loadingLocations" class="form-control">
     <i ng-show="loadingLocations" class="glyphicon glyphicon-refresh"></i>
 
     <h4>Custom templates for results</h4>