Revert "Commenting out package source mapping"

This reverts commit 3ce7e46.

Author: Joshua-Lester3

nuget.config

@@ -6,12 +6,12 @@
         <add key="nuget" value="https://api.nuget.org/v3/index.json" />
         <add key="EssentialCSharp" value="https://pkgs.dev.azure.com/intelliTect/_packaging/EssentialCSharp/nuget/v3/index.json" />
     </packageSources>
-    <!--<packageSourceMapping>
+    <packageSourceMapping>
         <packageSource key="nuget">
             <package pattern="*" />
         </packageSource>
         <packageSource key="EssentialCSharp">
             <package pattern="ContentFeedNuget" />
         </packageSource>
-    </packageSourceMapping>-->
+    </packageSourceMapping>
 </configuration>