machines: stop passing textCtrlAltDel and textSendShortcut props
machines: stop passing textCtrlAltDel and textSendShortcut props

We are using the default values anyway. In addition these are only valid
for users without libvirt-dbus on their system.

cockpit-project/cockpit,cockpit-project/cockpit,martinpitt/cockpit,mvollmer/cockpit,deryni/cockpit,moraleslazaro/cockpit,martinpitt/cockpit,cockpit-project/cockpit,moraleslazaro/cockpit,moraleslazaro/cockpit,deryni/cockpit,deryni/cockpit,cockpituous/cockpit,garrett/cockpit,martinpitt/cockpit,cockpituous/cockpit,moraleslazaro/cockpit,garrett/cockpit,cockpit-project/cockpit,cockpituous/cockpit,garrett/cockpit,mvollmer/cockpit,cockpit-project/cockpit,moraleslazaro/cockpit,mvollmer/cockpit,deryni/cockpit,cockpituous/cockpit,martinpitt/cockpit,garrett/cockpit,moraleslazaro/cockpit,mvollmer/cockpit,garrett/cockpit,cockpituous/cockpit,deryni/cockpit,martinpitt/cockpit,deryni/cockpit,moraleslazaro/cockpit,cockpituous/cockpit,mvollmer/cockpit,deryni/cockpit