virDomainObjGetOneDefState: Fix error message
virDomainObjGetOneDefState: Fix error message

It looks like the error message was copied from virsh, because
that's where we have @ctl. Nevertheless, it's @flags which is
invalid, not @ctl.

Signed-off-by: Michal Privoznik <83d82aaba2eed257f4814b0c239c260c4caaadf0@redhat.com>

jfehlig/libvirt,olafhering/libvirt,olafhering/libvirt,nertpinx/libvirt,andreabolognani/libvirt,eskultety/libvirt,andreabolognani/libvirt,eskultety/libvirt,jardasgit/libvirt,fabianfreyer/libvirt,fabianfreyer/libvirt,jardasgit/libvirt,olafhering/libvirt,olafhering/libvirt,crobinso/libvirt,eskultety/libvirt,zippy2/libvirt,jfehlig/libvirt,zippy2/libvirt,crobinso/libvirt,andreabolognani/libvirt,nertpinx/libvirt,fabianfreyer/libvirt,andreabolognani/libvirt,zippy2/libvirt,nertpinx/libvirt,jardasgit/libvirt,crobinso/libvirt,eskultety/libvirt,nertpinx/libvirt,fabianfreyer/libvirt,nertpinx/libvirt,libvirt/libvirt,crobinso/libvirt,libvirt/libvirt,jardasgit/libvirt,andreabolognani/libvirt,jfehlig/libvirt,libvirt/libvirt,fabianfreyer/libvirt,eskultety/libvirt,libvirt/libvirt,jardasgit/libvirt,jfehlig/libvirt,zippy2/libvirt