server/tests: fix timer for test_empty_success
server/tests: fix timer for test_empty_success

ya-mouse/spice,elmarco/spice,fgouget/spice,ya-mouse/spice,elmarco/spice,elmarco/spice,Fantu/spice,freedesktop-unofficial-mirror/spice__spice,freedesktop-unofficial-mirror/spice__spice,Fantu/spice,fgouget/spice,alon/spice-server,SPICE/spice,SPICE/spice,alon/spice-server,freedesktop-unofficial-mirror/spice__spice,alon/spice-server,ya-mouse/spice,elmarco/spice,Fantu/spice,fgouget/spice,alon/spice-server,freedesktop-unofficial-mirror/spice__spice,alon/spice-server,freedesktop-unofficial-mirror/spice__spice,Fantu/spice,elmarco/spice,SPICE/spice,fgouget/spice