Change to use updated state after poll

[vlovgr]

In #106 we changed to run rebalance listeners as part of poll, but forgot to change to use the updated state after poll, and we were still relying on the previous state.

[codecov]

Codecov Report

Merging #109 into master will increase coverage by <.01%.
The diff coverage is 90.9%.

@@            Coverage Diff             @@
##           master     #109      +/-   ##
==========================================
+ Coverage   98.01%   98.01%   +<.01%     
==========================================
  Files          38       38              
  Lines        1006     1007       +1     
  Branches       56       57       +1     
==========================================
+ Hits          986      987       +1     
  Misses         20       20

Impacted Files	Coverage Δ
.../scala/fs2/kafka/internal/KafkaConsumerActor.scala	94.63% <90.9%> (+0.02%)	⬆️

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[backuitist]

Yeah that state variable got me puzzled. Good that it's gone :)