Csv sample reader fix

[ham1]

unless my understanding is incorrect then it seems row wasn't being incremented.

[codecov-io]

Codecov Report

Merging #368 into trunk will increase coverage by 0.01%.
The diff coverage is 81.25%.

@@             Coverage Diff              @@
##              trunk     #368      +/-   ##
============================================
+ Coverage     58.35%   58.36%   +0.01%     
- Complexity    10288    10290       +2     
============================================
  Files          1164     1164              
  Lines         74127    74126       -1     
  Branches       7298     7298              
============================================
+ Hits          43254    43266      +12     
+ Misses        28359    28349      -10     
+ Partials       2514     2511       -3

Impacted Files	Coverage Δ	Complexity Δ
...apache/jmeter/report/core/CsvSampleReaderTest.java	78.18% <100%> (+4.49%)	11 <1> (-1)	⬇️
...org/apache/jmeter/report/core/CsvSampleReader.java	57.57% <50%> (+0.65%)	12 <0> (ø)	⬇️
src/core/org/apache/jmeter/report/core/Sample.java	41.02% <0%> (+2.56%)	11% <0%> (+1%)	⬆️
...mpler/hc/JMeterPoolingClientConnectionManager.java	30.95% <0%> (+3.17%)	11% <0%> (+1%)	⬆️
...re/org/apache/jmeter/engine/DistributedRunner.java	85.95% <0%> (+4.13%)	32% <0%> (+1%)	⬆️

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