Server:Switch ChatON chat msg taggings only if chaton-template-id

Instead of letting compile time decide between old chat templating
logic and the newer experimental chaton templating logic, now use
of --chaton-template-id cmdline argument enables the switching to
chaton based chat messages templating.

Also dont forget --chaton-meta-json to set the meta json file,
for use by the chaton templating logic.

Author: hanishkvc

examples/server/server.cpp

@@ -2957,6 +2957,7 @@ int main(int argc, char ** argv) {
             exit(2);
         }
         sparams.chat_template = params.chaton_template_id;
+        bOldChatTemplate = false;
     }
 
     std::unique_ptr<httplib::Server> svr;

examples/server/utils.hpp

@@ -15,7 +15,7 @@
 
 using json = nlohmann::ordered_json;
 
-const bool bOldChatTemplate = false;
+bool bOldChatTemplate = true;
 
 // https://community.openai.com/t/openai-chat-list-of-error-codes-and-types/357791/11
 enum error_type {