--yes can't skip confirmation of scale-out

[tabokie]

Bug Report

Please answer these questions before submitting your issue. Thanks!

1. What did you do?

tiup cluster scale-out tidb-test ./data/topology.yaml --yes

2. What did you expect to see?

Proceed without asking for confirmation.

3. What did you see instead?

[root@Copy-of-VM-EE-CentOS76-v1 pub-pastebin]# tiup cluster scale-out tidb-test ./data/topology.yaml --yes
Starting component `cluster`: /root/.tiup/components/cluster/v1.7.0/tiup-cluster scale-out tidb-test ./data/topology.yaml --yes
You have one or more of ["global", "monitored", "server_configs"] fields configured in
the scale out topology, but they will be ignored during the scaling out process.
If you want to use configs different from the existing cluster, cancel now and
set them in the specification fileds for each host.
Do you want to continue? [y/N]: (default=N)

4. What version of TiUP are you using (tiup --version)?

1.7.0 tiup
Go Version: go1.17.3
Git Ref: v1.7.0
GitHash: ce8eb0a645cc3ead96a44d67b1ecd5034d112cf0

5. Workaround:

yes | tiup ...