Core/Config: Error logging for ptree_bad_data

Ref 6487e2f2d6 (commitcomment-16888976)

(cherry picked from commit 9431b94bff)

src/server/worldserver/Main.cpp

@@ -226,7 +226,7 @@ extern int main(int argc, char** argv)
 
     if (networkThreads <= 0)
     {
-        TC_LOG_ERROR("server.worldserver", "Network.Threads cannot be less than 0");
+        TC_LOG_ERROR("server.worldserver", "Network.Threads must be greater than 0");
         return false;
     }