Cleanup: remove unused code

cmd/flamenco-worker-poc/cliargs.go

@@ -21,7 +21,6 @@ package main
  * ***** END GPL LICENSE BLOCK ***** */
 
 import (
-	"errors"
 	"flag"
 	"net/url"
 
@@ -29,8 +28,6 @@ import (
 	"gitlab.com/blender/flamenco-ng-poc/internal/worker"
 )
 
-var errURLWithoutHostName = errors.New("manager URL should contain a host name")
-
 var cliArgs struct {
 	version    bool
 	verbose    bool