playground: Fix alignment of output

[dveeden]

What problem does this PR solve?

tiup playground --tiproxy 1 v7.1.2:

Without this PR:

Connect TiDB:    mysql --comments --host 127.0.0.1 --port 4000 -u root
Connect TiProxy: mysql --comments --host 127.0.0.1 --port 6000 -u root
TiDB Dashboard:  http://127.0.0.1:2379/dashboard
Grafana:        http://127.0.0.1:3000

With this PR:

Connect TiDB:    mysql --comments --host 127.0.0.1 --port 4000 -u root
Connect TiProxy: mysql --comments --host 127.0.0.1 --port 36243 -u root
TiDB Dashboard:  http://127.0.0.1:2379/dashboard
Grafana:         http://127.0.0.1:3000

The line with Grafana: isn't aligned correctly

What is changed and how it works?

Check List

Tests

• Manual test (add detailed scripts or steps below)

Related changes

• Need to cherry-pick to the release branch

Release notes:

NONE

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (621598e) 55.52% compared to head (64e4082) 55.52%.

:exclamation: Current head 64e4082 differs from pull request most recent head 772f6f7. Consider uploading reports for the commit 772f6f7 to get more accurate results

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #2313 +/- ## ======================================= Coverage 55.52% 55.52% ======================================= Files 325 325 Lines 34725 34725 ======================================= Hits 19281 19281 Misses 13142 13142 Partials 2302 2302 ``` | [Flag](https://app.codecov.io/gh/pingcap/tiup/pull/2313/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pingcap) | Coverage Δ | | |---|---|---| | [playground](https://app.codecov.io/gh/pingcap/tiup/pull/2313/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pingcap) | `15.25% <100.00%> (ø)` | | | [tiup](https://app.codecov.io/gh/pingcap/tiup/pull/2313/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pingcap) | `33.48% <ø> (ø)` | | | [unittest](https://app.codecov.io/gh/pingcap/tiup/pull/2313/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pingcap) | `22.38% <0.00%> (+0.01%)` | :arrow_up: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pingcap#carryforward-flags-in-the-pull-request-comment) to find out more.

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[kaaaaaaang]

/lgtm

[kaaaaaaang]

/approve

[ti-chi-bot[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: kaaaaaaang

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The pull request process is described here

Needs approval from an approver in each of these files: - ~~[OWNERS](https://github.com/pingcap/tiup/blob/master/OWNERS)~~ [kaaaaaaang] Approvers can indicate their approval by writing `/approve` in a comment Approvers can cancel approval by writing `/approve cancel` in a comment

[ti-chi-bot[bot]]

[LGTM Timeline notifier]

Timeline:

• 2023-11-15 05:46:07.663554448 +0000 UTC m=+4227965.250664602: :ballot_box_with_check: agreed by kaaaaaaang.
• 2023-11-15 05:46:25.366744708 +0000 UTC m=+4227982.953854854: :heavy_multiplication_x::repeat: reset by ti-chi-bot[bot].

[ti-chi-bot[bot]]

New changes are detected. LGTM label has been removed.

[kaaaaaaang]

/lgtm /approve