Update qbs submodule.

To HEAD of 1.2 branch.

Change-Id: Ifc794212edb88b968a7d7de7ba1cf1259613daa9
Reviewed-by: Joerg Bornemann <joerg.bornemann@digia.com>
Reviewed-by: Eike Ziller <eike.ziller@digia.com>
QmlDesigner.PropertyEditor: Fixing layout

Template based SpinBoxes were to small in some cases.

Change-Id: I8bb3ca98cfe53172fc25171c81b3178657737d65
Reviewed-by: Thomas Hartmann <Thomas.Hartmann@digia.com>