Fix for search table view not showing

* SearchSample.sln:
* Info.plist:
* SearchSample.csproj:
* Contents.json:
* Contents.json: 

* GuidIndexedTableViewSource.cs: Fixed wrong items being shown in the
  Alert view

* GuidSearchTableViewSource.cs: Added method to update data.

* ParentViewController.cs: Fixed bug that second time search bar was
  clicked, the table view did not change to the search results.