Fix 1959: Make sure cleanup signal is sent if startup signal has been sent

[asvetlov]

#1959

[codecov-io]

Codecov Report

Merging #1982 into master will increase coverage by <.01%.
The diff coverage is 96.42%.

@@            Coverage Diff             @@
##           master    #1982      +/-   ##
==========================================
+ Coverage   97.08%   97.08%   +<.01%     
==========================================
  Files          37       37              
  Lines        7637     7641       +4     
  Branches     1332     1332              
==========================================
+ Hits         7414     7418       +4     
  Misses        100      100              
  Partials      123      123

Impacted Files	Coverage Δ
aiohttp/web.py	99.65% <96.42%> (ø)	⬆️

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