fix image saving in some cases

src/ui/window.rs

@@ -792,6 +792,8 @@ mod imp {
                             }
                             let resized =
                                 image_copy.resize(400, 400, image::imageops::FilterType::Lanczos3);
+                            // resize reoutputs rgba image; we can't save an rgba jpeg
+                            let resized = image::DynamicImage::ImageRgb8(resized.into());
                             resized.save_with_format(&save_path_copy, image::ImageFormat::Jpeg)?;
                             *mpris_art_path = Some(save_path_copy);
                             Ok(())