QMake: Also check for QtChooser in DesktopQtVersion::fromMap

This is only done for DesktopQtVersions, as I believe that only those
are affected by this.

Fixes more issues described in

Task-number: QTCREATORBUG-9841
Change-Id: Ifb7a797e71c812daef5bc5139bc339fb11423c15
Reviewed-by: Tobias Hunger <tobias.hunger@digia.com>
Reviewed-by: Orgad Shaneh <orgads@gmail.com>