Fix QWinTaskbarProgress::stateChanged() signature
Fix QWinTaskbarProgress::stateChanged() signature

The enum argument must have fully qualified type in order
for the old-style signal-slot connections to work.

Change-Id: I8de9f3030506cc0e1039cfb89e557ae31afaf36e
Reviewed-by: Friedemann Kleint <1b9f2592239daaec4856ccc1cfb4d2d55b35fb71@digia.com>

kobolabs/qtwinextras,kobolabs/qtwinextras