fix tidb count in error message

[SwanSpouse]

What problem does this PR solve?

fix tidb count in error message

What is changed and how it works?

error log message

Check List

Tests

• No code

Code changes

Side effects

Related changes

Release notes:

NONE

[CLAassistant]

All committers have signed the CLA.

[codecov-commenter]

Codecov Report

Merging #821 into master will increase coverage by 3.14%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master     #821      +/-   ##
==========================================
+ Coverage   49.57%   52.71%   +3.14%     
==========================================
  Files         250      262      +12     
  Lines       18557    18971     +414     
==========================================
+ Hits         9199    10000     +801     
+ Misses       7932     7409     -523     
- Partials     1426     1562     +136     

Flag	Coverage Δ
#cluster	44.68% <ø> (+0.05%)	⬆️
#dm	25.17% <ø> (+0.28%)	⬆️
#integrate	47.73% <0.00%> (+0.80%)	⬆️
#playground	22.17% <0.00%> (?)
#tiup	10.83% <ø> (ø)
#unittest	18.81% <0.00%> (ø)

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

Impacted Files	Coverage Δ
components/playground/playground.go	41.09% <0.00%> (+41.09%)	⬆️
components/playground/instance/drainer.go	0.00% <0.00%> (ø)
components/playground/instance/instance.go	36.36% <0.00%> (ø)
components/playground/instance/process.go	81.08% <0.00%> (ø)
components/playground/instance/ticdc.go	0.00% <0.00%> (ø)
components/playground/instance/tidb.go	77.14% <0.00%> (ø)
components/playground/instance/tiflash.go	0.00% <0.00%> (ø)
components/playground/instance/tikv_config.go	100.00% <0.00%> (ø)
components/playground/instance/pump.go	0.00% <0.00%> (ø)
components/playground/instance/tiflash_config.go	0.00% <0.00%> (ø)
... and 17 more

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[july2993]

/merge
thanks