fix __all_virtual_thread result incorrect

src/share/ob_occam_time_guard.h

@@ -81,6 +81,7 @@ private:
       }
       if (OB_FAIL(back_thread_->init_and_start([this]() {
         while(true) {
+          IGNORE_RETURN lib::Thread::update_loop_ts();
           if (!back_thread_->is_stopped()) {
             for (int64_t idx = 0; idx < MAX_THREAD_NUM; ++idx) {
               ClickPoint point = points_[idx].atomic_copy();