Mark the "Auto" variable scope as not expensive

This change causes the "Auto" variable scope to be marked as not
'expensive' in the VS Code debug protocol so that it is always expanded by
default in VS Code's debug client UI.

Author: daviwil

src/PowerShellEditorServices.Protocol/DebugAdapter/Scope.cs

@@ -30,7 +30,8 @@ public static Scope Create(VariableScope scope)
                 Name = scope.Name,
                 VariablesReference = scope.Id,
                 // Temporary fix for #95 to get debug hover tips to work well at least for the local scope.
-                Expensive = (scope.Name != VariableContainerDetails.LocalScopeName)
+                Expensive = ((scope.Name != VariableContainerDetails.LocalScopeName) &&
+                             (scope.Name != VariableContainerDetails.AutoVariablesName))
             };
         }
     }