Build fixes of tutorial25.

Author: arobenko

tutorials/tutorial25/README.md

@@ -54,7 +54,7 @@ Let's take a look how the protocol options above can be used to force usage of t
 The [ServerSession](src/ServerSession.h) defines its protocol options like this:
 ```cpp
 using ServerProtocolOptions =
-    ServerInputMessagesDynMemMsgFactoryDefaultOptionsT<
+    tutorial25::options::ServerInputMessagesDynMemMsgFactoryDefaultOptionsT<
         tutorial25::options::ServerDefaultOptions
     >;
 ```

tutorials/tutorial25/src/ServerSession.h

@@ -30,7 +30,7 @@ class ServerSession : public Session
         >;
 
     using ServerProtocolOptions = 
-        ServerInputMessagesDynMemMsgFactoryDefaultOptionsT<
+        tutorial25::options::ServerInputMessagesDynMemMsgFactoryDefaultOptionsT<
             tutorial25::options::ServerDefaultOptions
         >;