Remove ConfigureAwait(false) from desktop

[VMelnalksnis]

Fixes #391

[codecov]

Codecov Report

Merging #485 (67308d6) into master (3d69b7b) will increase coverage by 0.32%.
The diff coverage is 67.56%.

@@            Coverage Diff             @@
##           master     #485      +/-   ##
==========================================
+ Coverage   66.01%   66.33%   +0.32%     
==========================================
  Files         279      279              
  Lines        8389     8389              
  Branches      551      551              
==========================================
+ Hits         5538     5565      +27     
+ Misses       2678     2651      -27     
  Partials      173      173              

Impacted Files	Coverage Δ
...ade.Avalonia.Core/Authentication/LoginViewModel.cs	9.37% <0.00%> (ø)
...Core/Configuration/ApplicationSettingsViewModel.cs	29.26% <0.00%> (ø)
...a.Core/Configuration/UserConfigurationValidator.cs	17.39% <0.00%> (ø)
...onia.Core/Configuration/UserConfigurationWriter.cs	15.78% <0.00%> (ø)
....Core/Counterparties/CounterpartyMergeViewModel.cs	82.85% <0.00%> (ø)
...nomeshade.Avalonia.Core/Imports/ImportViewModel.cs	16.12% <0.00%> (ø)
...ce/Gnomeshade.Avalonia.Core/MainWindowViewModel.cs	5.92% <0.00%> (ø)
....Avalonia.Core/Transactions/Links/LinkViewModel.cs	45.45% <14.28%> (ø)
...e/Counterparties/CounterpartyUpsertionViewModel.cs	43.75% <50.00%> (ø)
...alonia.Core/Products/CategoryUpsertionViewModel.cs	57.57% <50.00%> (ø)
... and 29 more

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