fix robot v1 api update issue (#14050)
fix robot v1 api update issue (#14050)

For the v1 api, it will not update the description of a robot account.

Signed-off-by: Wang Yan <63b20dea16c07a874bc9bf767df5575676113cb6@vmware.com>
reasonerjt/harbor,reasonerjt/harbor,wy65701436/harbor,wy65701436/harbor,reasonerjt/harbor,reasonerjt/harbor,reasonerjt/harbor,wy65701436/harbor,wy65701436/harbor,wy65701436/harbor,wy65701436/harbor,reasonerjt/harbor