[fix] destroy screen capturer only when clean up

src/screen_capturer/windows/screen_capturer_wgc.cpp

@@ -210,6 +210,7 @@ int ScreenCapturerWgc::Stop() {
       sessions_[i].running_ = false;
     }
   }
+  running_ = false;
 
   return 0;
 }

src/single_window/render.cpp

@@ -336,9 +336,6 @@ int Render::StopScreenCapturer() {
   if (screen_capturer_) {
     LOG_INFO("Stop screen capturer")
     screen_capturer_->Stop();
-    screen_capturer_->Destroy();
-    delete screen_capturer_;
-    screen_capturer_ = nullptr;
   }
 
   return 0;