commands: Fix handling of persistent CLI flags

See #4607

commands/hugo.go

@@ -70,7 +70,7 @@ func (r Response) IsUserError() bool {
 // Execute adds all child commands to the root command HugoCmd and sets flags appropriately.
 // The args are usually filled with os.Args[1:].
 func Execute(args []string) Response {
-	hugoCmd := newHugoCompleteCmd()
+	hugoCmd := newCommandsBuilder().addAll().build()
 	cmd := hugoCmd.getCommand()
 	cmd.SetArgs(args)