Fix cancelled requests being logged as errors during startup

Also cleanup ApplicationBuilderExtensions.cs

src/Tgstation.Server.Host/Core/Application.cs

@@ -437,15 +437,12 @@ namespace Tgstation.Server.Host.Core
 			// Add the X-Powered-By response header
 			applicationBuilder.UseServerBranding(assemblyInformationProvider);
 
-			// 503 requests made while the application is starting
-			applicationBuilder.UseAsyncInitialization(async (cancellationToken) =>
-			{
-				await instanceManager.Ready.WithToken(cancellationToken);
-			});
-
 			// suppress OperationCancelledExceptions, they are just aborted HTTP requests
 			applicationBuilder.UseCancelledRequestSuppression();
 
+			// 503 requests made while the application is starting
+			applicationBuilder.UseAsyncInitialization(instanceManager.Ready.WithToken);
+
 			if (generalConfiguration.HostApiDocumentation)
 			{
 				applicationBuilder.UseSwagger();

src/Tgstation.Server.Host/Extensions/ApplicationBuilderExtensions.cs

@@ -103,6 +103,7 @@ namespace Tgstation.Server.Host.Extensions
 		{
 			if (applicationBuilder == null)
 				throw new ArgumentNullException(nameof(applicationBuilder));
+
 			applicationBuilder.Use(async (context, next) =>
 			{
 				var logger = GetLogger(context);
@@ -124,8 +125,7 @@ namespace Tgstation.Server.Host.Extensions
 					.ExecuteResultAsync(new ActionContext
 					{
 						HttpContext = context,
-					})
-					;
+					});
 				}
 			});
 		}