Drop loop.current_task() from helpers.current_task()

[asvetlov]

Fix #2826

[codecov-io]

Codecov Report

Merging #3126 into master will increase coverage by 0.06%.
The diff coverage is 50%.

@@            Coverage Diff             @@
##           master    #3126      +/-   ##
==========================================
+ Coverage   98.06%   98.12%   +0.06%     
==========================================
  Files          43       43              
  Lines        7837     7851      +14     
  Branches     1354     1357       +3     
==========================================
+ Hits         7685     7704      +19     
+ Misses         56       53       -3     
+ Partials       96       94       -2

Impacted Files	Coverage Δ
aiohttp/helpers.py	96.81% <50%> (+0.85%)	⬆️
aiohttp/web_request.py	98.99% <0%> (+0.31%)	⬆️

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[new issue]: https://github.com/aio-libs/aiohttp/issues/new