Fixed issues from code review

Source/MQTTnet.AspnetCore/MQTTnet.AspNetCore.csproj

@@ -23,7 +23,6 @@
 
   <ItemGroup Condition="'$(TargetFramework)' == 'netcoreapp3.1'">
     <FrameworkReference Include="Microsoft.AspNetCore.App" />
-    <PackageReference Include="System.IO.Pipelines" Version="4.7.2" />
   </ItemGroup>
     
   <ItemGroup Condition="'$(TargetFramework)' != 'netcoreapp3.1'">

Source/MQTTnet/Client/Options/MqttClientOptionsBuilderTlsParameters.cs

@@ -27,9 +27,9 @@ namespace MQTTnet.Client.Options
         public IEnumerable<X509Certificate> Certificates { get; set; }
 #endif
 
-        #if NETCOREAPP3_1
-	    public List<SslApplicationProtocol> ApplicationProtocols {get;set;}
-        #endif 
+#if NETCOREAPP3_1
+	    public List<SslApplicationProtocol> ApplicationProtocols { get;set; }
+#endif 
 
 	    public bool AllowUntrustedCertificates { get; set; }