Fix mirror stats with --quiet flag

Community Contribution License

All community contributions in this pull request are licensed to the project maintainers under the terms of the [Apache 2 license] (https://www.apache.org/licenses/LICENSE-2.0). By creating this pull request I represent that I have the right to license the contributions to the project maintainers under the Apache 2 license.

Description

Fix a bunch of issues for mirror stats with --quiet flag

Motivation and Context

Fixes https://github.com/minio/mc/issues/4537

How to test this PR?

Types of changes

[ ] Bug fix (non-breaking change which fixes an issue)
[ ] New feature (non-breaking change which adds functionality)
[ ] Optimization (provides speedup with no functional changes)
[ ] Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

[ ] Fixes a regression (If yes, please add commit-id or PR # here)
[ ] Unit tests added/updated
[ ] Internal documentation updated
[ ] Create a documentation update request here

minio / mc