feat(display): Add revert display config on disconnect option (#3613)

src/stream.cpp

@@ -1882,11 +1882,17 @@ namespace stream {
 
       // If this is the last session, invoke the platform callbacks
       if (--running_sessions == 0) {
+        bool revert_display_config {config::video.dd.config_revert_on_disconnect};
         if (proc::proc.running()) {
 #if defined SUNSHINE_TRAY && SUNSHINE_TRAY >= 1
           system_tray::update_tray_pausing(proc::proc.get_last_run_app_name());
 #endif
         } else {
+          // We have no app running and also no clients anymore.
+          revert_display_config = true;
+        }
+
+        if (revert_display_config) {
           display_device::revert_configuration();
         }