Fix swallow_errors bad behavior with limit with option deduct_when as…

[tlauga]

Fix swallow_errors bad behavior with limit with option deduct_when as issue #363

Ticket: SEO-739

[codecov]

Codecov Report

Base: 100.00% // Head: 99.53% // Decreases project coverage by -0.46% ⚠️

Coverage data is based on head (315fa27) compared to base (6c96612).
Patch coverage: 33.33% of modified lines in pull request are covered.

Additional details and impacted files

@@             Coverage Diff             @@
##            master     #364      +/-   ##
===========================================
- Coverage   100.00%   99.53%   -0.47%     
===========================================
  Files            7        7              
  Lines          857      862       +5     
===========================================
+ Hits           857      858       +1     
- Misses           0        4       +4     

Impacted Files	Coverage Δ
flask_limiter/extension.py	98.87% <33.33%> (-1.13%)	⬇️

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[alisaifee]

Looks about right to me, thanks for the PR!
I'll take care of the dropped test coverage.