Refactor default abs sender

[fedochet]

I was studying your library and spotted some code duplication in DefaultAbsSender, so I decided to refactor it
I did not change any behavior - only rearranged some lines in order to make refactorings clearer

[codecov-io]

Codecov Report

Merging #272 into dev will decrease coverage by 0.7%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##               dev    #272      +/-   ##
==========================================
- Coverage     7.52%   6.82%   -0.71%     
+ Complexity     167     161       -6     
==========================================
  Files          145     145              
  Lines         4743    4659      -84     
  Branches       416     405      -11     
==========================================
- Hits           357     318      -39     
+ Misses        4344    4302      -42     
+ Partials        42      39       -3

Impacted Files	Coverage Δ	Complexity Δ
...g/telegram/telegrambots/bots/DefaultAbsSender.java	0% <0%> (ø)	0 <0> (ø)	⬇️
...egrambots/updatesreceivers/ExponentialBackOff.java	32.81% <0%> (-18.75%)	4% <0%> (-4%)
...legrambots/updatesreceivers/DefaultBotSession.java	38.46% <0%> (-17.49%)	8% <0%> (ø)
.../telegram/telegrambots/bots/DefaultBotOptions.java	27.27% <0%> (-9.1%)	3% <0%> (-2%)

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[fedochet]

I am not sure why CodeCov fails - considering I didn't change mentioned files 😄