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 ✅

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

❗ 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

@@           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	Coverage Δ
playground	15.25% <100.00%> (ø)
tiup	33.48% <ø> (ø)
unittest	22.38% <0.00%> (+0.01%)	⬆️

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[kaaaaaaang]

/lgtm

[kaaaaaaang]

/approve

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: kaaaaaaang

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

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

[ti-chi-bot]

New changes are detected. LGTM label has been removed.

[kaaaaaaang]

/lgtm /approve