[3.5] Fix handling of chunked+gzipped response when first chunk does …

[asvetlov]

…not give uncompressed data (#3477) (#3485)

(cherry picked from commit a929c06)

Co-authored-by: Коренберг Марк [email protected]

What do these changes do?

Are there changes in behavior for the user?

Related issue number

Checklist

• I think the code is well written
• Unit tests for the changes exist
• Documentation reflects the changes
• If you provide code modification, please add yourself to CONTRIBUTORS.txt
  • The format is <Name> <Surname>.
  • Please keep alphabetical order, the file is sorted by names.
• Add a new news fragment into the CHANGES folder
  • name it <issue_id>.<type> for example (588.bugfix)
  • if you don't have an issue_id change it to the pr id after creating the pr
  • ensure type is one of the following:
    • .feature: Signifying a new feature.
    • .bugfix: Signifying a bug fix.
    • .doc: Signifying a documentation improvement.
    • .removal: Signifying a deprecation or removal of public API.
    • .misc: A ticket has been closed, but it is not of interest to users.
  • Make sure to use full sentences with correct case and punctuation, for example: "Fix issue with non-ascii contents in doctest text files."

[codecov-io]

Codecov Report

Merging #3488 into 3.5 will decrease coverage by 0.02%.
The diff coverage is 80%.

@@            Coverage Diff             @@
##              3.5    #3488      +/-   ##
==========================================
- Coverage   97.95%   97.93%   -0.03%     
==========================================
  Files          44       44              
  Lines        8553     8557       +4     
  Branches     1377     1378       +1     
==========================================
+ Hits         8378     8380       +2     
- Misses         71       72       +1     
- Partials      104      105       +1

Impacted Files	Coverage Δ
aiohttp/streams.py	98.72% <80%> (-0.51%)	⬇️

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