Fix: Transaction class with virtual destructor
Fix: Transaction class with virtual destructor

The class had virtual function but non-virtual destructor.

hughsie/libhif,hughsie/libhif,rpm-software-management/libhif,rpm-software-management/libhif,rpm-software-management/libhif,rpm-software-management/libhif,hughsie/libhif,rpm-software-management/libdnf,rpm-software-management/libdnf,rpm-software-management/libdnf,rpm-software-management/libdnf,hughsie/libhif