server: do not pass log file to children (#29212)

tools/server/server-models.cpp

@@ -467,6 +467,7 @@ static std::filesystem::path get_server_exec_path() {
 }
 
 static void unset_reserved_args(common_preset & preset, bool unset_model_args) {
+    preset.unset_option("LLAMA_ARG_LOG_FILE");
     preset.unset_option("LLAMA_ARG_SSL_KEY_FILE");
     preset.unset_option("LLAMA_ARG_SSL_CERT_FILE");
     preset.unset_option("LLAMA_API_KEY");