fix: Worker node statistics error

Created by: weili520

Signed-off-by: TheYoungManLi cjl@kubesphere.io

What type of PR is this?

/kind bug

What this PR does / why we need it:

Which issue(s) this PR fixes:

Fixes ##4783

Special notes for reviewers:

Does this PR introduced

a user-facing change?

NONE

Additional documentation, usage docs, etc.:

The control-plane node also can be a work node.