Fix username/password login

[VMelnalksnis]

Fixes #486.

[codecov]

Codecov Report

Merging #487 (ff6645c) into master (67308d6) will decrease coverage by 0.03%.
The diff coverage is 70.58%.

@@            Coverage Diff             @@
##           master     #487      +/-   ##
==========================================
- Coverage   66.33%   66.30%   -0.04%     
==========================================
  Files         279      278       -1     
  Lines        8389     8417      +28     
  Branches      551      557       +6     
==========================================
+ Hits         5565     5581      +16     
- Misses       2651     2659       +8     
- Partials      173      177       +4     

Impacted Files	Coverage Δ
...omeshade.WebApi/Configuration/AuthConfiguration.cs	91.01% <53.33%> (-8.99%)	⬇️
...Gnomeshade.WebApi.Client/TokenDelegatingHandler.cs	72.97% <83.33%> (+7.97%)	⬆️
...ource/Gnomeshade.WebApi.Client/GnomeshadeClient.cs	78.57% <100.00%> (-0.34%)	⬇️
...urce/Gnomeshade.WebApi.Client/GnomeshadeOptions.cs	0.00% <0.00%> (-100.00%)	⬇️
source/Gnomeshade.WebApi.Client/SuccessfulLogin.cs

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