Revert "Add 'remove source'"

This reverts commit 43e7e0b2d4.

build/yaml/ci-build-steps.yml

@@ -9,10 +9,6 @@ steps:
 
 - template: sdk_dotnet_v4_org-feed-setup-steps.yml
 
-- powershell: |
-    dotnet nuget remove source SDK_Dotnet_V4_org
-  displayName: Remove SDK_Dotnet_V4_org feed source reference from nuget.config
-
 - task: PowerShell@2
   displayName: 'DEBUG: Upload Coverage Files to Coveralls.io https://coveralls.io/github/microsoft/botbuilder-dotnet'
   inputs: