Remove unused field in Insights test class

Author: markcowl

src/ResourceManager/Insights/Commands.Insights.Test/Diagnostics/SetDiagnosticSettingCommandTests.cs

@@ -43,7 +43,6 @@ public class SetDiagnosticSettingCommandTests
         DiagnosticSettingsResource calledSettings = null;
 
         private Microsoft.Rest.Azure.AzureOperationResponse<DiagnosticSettingsResourceCollection> multipleResponse;
-        private bool singleResult;
 
         public SetDiagnosticSettingCommandTests(Xunit.Abstractions.ITestOutputHelper output)
         {
@@ -105,7 +104,6 @@ public SetDiagnosticSettingCommandTests(Xunit.Abstractions.ITestOutputHelper out
                     // this.calledResourceId = resourceId;
                     // this.diagnosticSettingName = "service";
                     this.calledSettings = multipleResponse.Body.Value[0];
-                    this.singleResult = false;
                     return Task.FromResult(multipleResponse);
                 });