Fix .NET SDK serialization bugs in SubFormFieldRuleAction.TypeEnum and optional int request fields#523

mwojcik-dropbox wants to merge 2 commits intomainhellosign/hellosign-openapi:mainfrom

fix/dotnet-sdk-generator-default-valueshellosign/hellosign-openapi:fix/dotnet-sdk-generator-default-valuesCopy head branch name to clipboard