fix(phone-list.template.html): reduce debounce value

Author: felixzapata

app/phone-list/phone-list.template.html

@@ -5,7 +5,7 @@
 
       <div>
         <label for="search">Search:</label> 
-        <input id="search" ng-model="$ctrl.query" ng-model-options="{ debounce: 900 }">
+        <input id="search" ng-model="$ctrl.query" ng-model-options="{ debounce: 300 }">
       </div>
 
       <div class="aria-status" aria-live="assertive" aria-atomic="true"></div>