fix: Fix failed to assign an administrator to a project

Created by: xuliwenwenwen

Signed-off-by: xuliwenwenwen liwenxu@yunify.com

What type of PR is this? /kind bug

What this PR does / why we need it:

Which issue(s) this PR fixes:

Fixes ##kubesphere/kubesphere#3819

Special notes for reviewers:

Additional documentation, usage docs, etc.: