Fix 1bpp image decoding and add a test image (#252)

src/decoder/image.rs

@@ -687,8 +687,6 @@ impl Image {
                 let row = &mut row[..data_row_bytes];
                 reader.read_exact(row)?;
 
-                println!("chunk={chunk_index}, index={i}");
-
                 // Skip horizontal padding
                 if chunk_row_bytes > data_row_bytes {
                     let len = u64::try_from(chunk_row_bytes - data_row_bytes)?;