fix locked DMG after installing Qt OSX package and starting creator

  - the workingdir was inside the dmg so it couldn't unmounted

Task-number: QTBUG-28963

Change-Id: I183098108743d9cc0bd00fb6bfaa3e5755c08191
Reviewed-by: Eike Ziller <eike.ziller@digia.com>

dist/installer/ifw/packages/org.qtproject.qtcreator.application/meta/installscript.qs

@@ -202,7 +202,7 @@ Component.prototype.installationFinished = function()
         if (component.installed && installer.isInstaller() && installer.status == QInstaller.Success) {
             var isLaunchQtCreatorCheckBoxChecked = component.userInterface("LaunchQtCreatorCheckBoxForm").launchQtCreatorCheckBox.checked;
             if (isLaunchQtCreatorCheckBoxChecked)
-                installer.executeDetached(component.qtCreatorBinaryPath);
+                installer.executeDetached(component.qtCreatorBinaryPath, new Array(), "@homeDir@");
         }
     } catch(e) {
         print(e);