Use new location for qt creator packages

With the new link, we can more flexibly decide which Qt Creator build to
package, be it a snapshot build, or an already released build

Change-Id: Iae0727326dd30b8c69b02beb3e97499651cc04d9
Reviewed-by: Kai Koehne <kai.koehne@digia.com>
Reviewed-by: Iikka Eklund <iikka.eklund@digia.com>