feat(app): buy items page themed text color

Author: mas-iota

widget/templates/BuyItems.html

@@ -1,4 +1,4 @@
-<div class="holder padding-zero" ng-controller="WidgetBuyItemsCtrl as
+<div class="holder padding-zero mdc-theme--text-primary-on-background" ng-controller="WidgetBuyItemsCtrl as
      WidgetBuyItems">
 
   <div class="buy-products-header">
@@ -19,12 +19,12 @@
     <p>{{WidgetBuyItems.totalPoints}}</p>
     <div></div>
   </div>
-  
+
   <div class="next-btn margin-top-twenty">
     <button class="btn btn-primary stretch margin-top"
             href="javascript:void(0);" ng-click="WidgetBuyItems.confirmCode()"
             ng-disabled="WidgetBuyItems.isNextDisabled()"
         >{{WidgetBuyItems.strings["general.next"]}}
     </button>
   </div>
-</div>
+</div>