Remove myget feed from NuGet.config. Again.

Remove myget.org from our feed again. I will try and come up with a
better solution for this in master.

Author: gregg-miskelly

coreclr-debug/NuGet.config

@@ -4,7 +4,5 @@
     <!--To inherit the global NuGet package sources remove the <clear/> line below -->
     <clear />
     <add key="api.nuget.org" value="https://api.nuget.org/v3/index.json" />
-    <!-- This dependency is not present in the release branch -->
-    <add key="coreclrdebug" value="https://www.myget.org/F/coreclr-debug/api/v3/index.json" />    
   </packageSources>
 </configuration>