remove spurious print in set-tag

[ankit-db]

What changes are proposed in this pull request?

I introduced an unnecessary print statement in set tag when I was adding delete tag. This PR removes that.

How is this patch tested?

Manual.

Release Notes

Is this a user-facing change?

• No. You can skip the rest of this section.
• Yes. Give a description of this change to be included in the release notes for MLflow users.

(Details in 1-2 sentences. You can just refer to another PR with a description if this PR is part of a larger change.)

What component(s) does this PR affect?

• UI
• CLI
• API
• REST-API
• Examples
• Docs
• Tracking
• Projects
• Artifacts
• Models
• Scoring
• Serving
• R
• Java
• Python

How should the PR be classified in the release notes? Choose one:

• rn/breaking-change - The PR will be mentioned in the "Breaking Changes" section
• rn/none - No description will be included. The PR will be mentioned only by the PR number in the "Small Bugfixes and Documentation Updates" section
• rn/feature - A new user-facing feature worth mentioning in the release notes
• rn/bug-fix - A user-facing bug fix worth mentioning in the release notes
• rn/documentation - A user-facing documentation change worth mentioning in the release notes

[dbczumar]

LGTM!