mirror:not overwrit target object when mirror watch

[dormanze]

fix #5192

Community Contribution License

All community contributions in this pull request are licensed to the project maintainers
under the terms of the Apache 2 license.
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

Motivation and Context

make sure mirror command overwrit same when the watch is used and when the watch command is not used.

How to test this PR?

mc mb local/bucket
mc mb peer/bucket
echo "1" > txt
mc cp txt peer/bucket
mc mirror -w local/bucket peer/bucket
echo "2" > txt
mc cp txt local/bucket
mc cat peer/bucket/txt

mc mb local/bucket
mc mb peer/bucket
echo "3" > txt
mc cp txt peer/bucket
mc mirror -w --overwrite local/bucket peer/bucket
echo "4" > txt
mc cp txt local/bucket
mc cat peer/bucket/txt

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