Drop hack to fix byte count.

The byte count on this 800x600 32-bit image should come to 1,920,000
bytes... But it came to 1,920,032 bytes. I'm not sure where the extra
32 bytes come from, but I have to go fix it before I get to call the
decoder complete.

src/main.rs

@@ -42,7 +42,7 @@ fn main() -> Result<(), DecodeError> {
     let mut writer = encoder.write_header().unwrap();
 
     let data: Vec<u8> = PixelIterExpander::try_new(decoder).unwrap().collect();
-    let result = writer.write_image_data(&data[0..(data.len()-32)]);
+    let result = writer.write_image_data(&data);
     if let Err(res) = result {
         eprintln!("{}", res);
     }