account.application.deauthorized: remove ValueError

[blueyed]

The account might still be accessible, e.g. if it was connected multiple
times.

[codecov]

Codecov Report

Merging #83 into next will decrease coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##             next      #83      +/-   ##
==========================================
- Coverage   99.08%   99.08%   -0.01%     
==========================================
  Files          34       34              
  Lines        1857     1854       -3     
  Branches      174      173       -1     
==========================================
- Hits         1840     1837       -3     
  Misses         10       10              
  Partials        7        7

Flag	Coverage Δ
#py36dj111psql	99.08% <100%> (-0.01%)	⬇️
#py36dj20psql	99.08% <100%> (-0.01%)	⬇️

Impacted Files	Coverage Δ
pinax/stripe/webhooks.py	99.07% <100%> (-0.01%)	⬇️
pinax/stripe/admin.py	100% <0%> (ø)	⬆️

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