Removed unused var from demos

[shadrus]

No description provided.

[codecov-io]

Codecov Report

Merging #2695 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #2695   +/-   ##
=======================================
  Coverage   98.02%   98.02%           
=======================================
  Files          39       39           
  Lines        7289     7289           
  Branches     1266     1266           
=======================================
  Hits         7145     7145           
  Misses         44       44           
  Partials      100      100

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[asvetlov]

Thanks!

[lock]

This thread has been automatically locked since there has not been any recent activity after it was closed. Please open a [new issue] for related bugs.
If you feel like there's important points made in this discussion, please include those exceprts into that [new issue].
[new issue]: https://github.com/aio-libs/aiohttp/issues/new