Make Transaction deletion match better what is really happening
Make Transaction deletion match better what is really happening

Old text could have been read as allowing something like delete sender()
in signal handler which wouldn't have worked properly.

The transaction will be deleted when PackageKit signals Destroy or there's
an error, so unless pointers are protected with QPointer or similar,
all the bets are off for pointer references after finished().

hughsie/PackageKit-Qt,aleixpol/PackageKit-Qt,hughsie/PackageKit-Qt,aleixpol/PackageKit-Qt,hughsie/PackageKit-Qt,aleixpol/PackageKit-Qt