machines: Do not import listing.less in machines.less
machines: Do not import listing.less in machines.less

It's already imported from cockpit-components-listing.jsx which we
import.

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