style(app-builder-ext): single line if-statements

Author: jaredcnance

src/JsonApiDotNetCore/Extensions/IApplicationBuilderExtensions.cs

@@ -10,9 +10,7 @@ public static IApplicationBuilder UseJsonApi(this IApplicationBuilder app, bool
             app.UseMiddleware<RequestMiddleware>();
 
             if (useMvc)
-            {
                 app.UseMvc();
-            }
 
             return app;
         }