file transfer: send cancel message when user cancels a transfer
file transfer: send cancel message when user cancels a transfer

When a user cancel's a file transfer, we should send a STATUS_CANCELED
message rather than an STATUS_ERROR message. The latter triggers a bug
in the vdagent where the file remains opened by the vdagent in the guest
and cannot be removed.

Signed-off-by: Jonathon Jongsma <c7254805a17bd5c41e24c3a278fcbf3afcdfb0fa@redhat.com>

SPICE/spice-gtk,flexVDI/spice-gtk,SPICE/spice-gtk,SPICE/spice-gtk,fgouget/spice-gtk,fgouget/spice-gtk,fgouget/spice-gtk,flexVDI/spice-gtk,SPICE/spice-gtk