playground: Fix TiFlash config not working

[breezewish]

What problem does this PR solve?

In previous refines there was a mistake.

What is changed and how it works?

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No code

Code changes

• Has exported function/method change
• Has exported variable/fields change
• Has interface methods change
• Has persistent data change

Side effects

• Possible performance regression
• Increased code complexity
• Breaking backward compatibility

Related changes

• Need to cherry-pick to the release branch
• Need to update the documentation

Release notes:

NONE

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• kaaaaaaang

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[codecov-commenter]

Codecov Report

Patch coverage: 100.00% and project coverage change: +5.04 🎉

Comparison is base (59930c2) 50.73% compared to head (299c8f7) 55.77%.

❗ Current head 299c8f7 differs from pull request most recent head 501b77e. Consider uploading reports for the commit 501b77e to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2190      +/-   ##
==========================================
+ Coverage   50.73%   55.77%   +5.04%     
==========================================
  Files         318      318              
  Lines       33459    33465       +6     
==========================================
+ Hits        16973    18662    +1689     
+ Misses      14453    12562    -1891     
- Partials     2033     2241     +208     

Flag	Coverage Δ
cluster	44.41% <ø> (+8.42%)	⬆️
dm	26.08% <ø> (+0.07%)	⬆️
playground	15.45% <100.00%> (+0.03%)	⬆️
tiup	16.01% <ø> (ø)
unittest	22.77% <0.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
components/playground/main.go	60.20% <100.00%> (+2.30%)	⬆️
components/playground/playground.go	50.83% <100.00%> (-0.11%)	⬇️

... and 78 files with indirect coverage changes

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[kaaaaaaang]

/merge

[ti-chi-bot]

This pull request has been accepted and is ready to merge.

Commit hash: 3775314

[ti-chi-bot]

@breezewish: Your PR was out of date, I have automatically updated it for you.

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[CLAassistant]

All committers have signed the CLA.

[kaaaaaaang]

/merge

[ti-chi-bot]

This pull request has been accepted and is ready to merge.

Commit hash: 501b77e