remove erroneous slashes from appsettings.json#3

stowg wants to merge 1 commit intoaws-samples:mainaws-samples/aws-netcore-aspnetmvc-amazon-cognito-authentication-authorization-samples:mainfrom

stowg:mainstowg/aws-netcore-aspnetmvc-amazon-cognito-authentication-authorization-samples:mainCopy head branch name to clipboard