[fix] recover Windows capture backends after secure desktop exit

src/screen_capturer/windows/screen_capturer_wgc.h

@@ -40,6 +40,8 @@ class ScreenCapturerWgc : public ScreenCapturer,
 
  protected:
   void CleanUp();
+  int RebuildSessions(int preferred_monitor_index);
+  int StartSessions(bool show_cursor);
 
  private:
   HMONITOR monitor_;
@@ -74,4 +76,4 @@ class ScreenCapturerWgc : public ScreenCapturer,
   std::mutex frame_mutex_;
 };
 }  // namespace crossdesk
-#endif
+#endif