fix(save): decouple native saves from screenshots (#956)

src/app/update/mod.rs

@@ -6994,11 +6994,6 @@ impl OpenCADStudio {
 
             Message::ThumbnailCaptureFrame => self.on_thumbnail_capture_frame(),
 
-            Message::ThumbnailCaptureFinished => {
-                self.thumbnail_capture_clean = false;
-                Task::none()
-            }
-
             #[cfg(not(target_arch = "wasm32"))]
             Message::SaveFinished(outcome) => self.on_save_finished(outcome),