Fix item-text-wrap

Looks like that item-text-wrap `overlow:` and `white-space` properties don't actually override the default behavior. This fix changes both properties, `visible` and `normal`, on item-text-wrap.

<ion-list>
  <ion-item ng-repeat="activity in activities"
            class="item-text-wrap"
            href="#/tab/activity/{{activity.id}}">
  </ion-item>
</ion-list>