fix card tests

Author: BenOsodrac

core/src/components/card/test/theme-ionic/index.html

@@ -32,7 +32,7 @@
         </ion-toolbar>
       </ion-header>
 
-      <ion-content class="ionic-padding-space-400" id="content" no-bounce>
+      <ion-content class="ion-padding-space-400" id="content" no-bounce>
         <h4>Preview options</h4>
 
         <p>