test: Fix HIL write-bin test

Author: SergioGasquez

espflash/src/bin/espflash.rs

@@ -350,10 +350,10 @@ fn write_bin(args: WriteBinArgs, config: &Config) -> Result<()> {
 
     // If the file size is not divisible by 4, we need to pad `FF` bytes to the end
     let size = f.metadata().into_diagnostic()?.len();
-    let padded_bytes = 4 - (size % 4);
+    // let padded_bytes = 4 - (size % 4);
     let mut buffer = Vec::with_capacity(size.try_into().into_diagnostic()?);
     f.read_to_end(&mut buffer).into_diagnostic()?;
-    buffer.extend_from_slice(&vec![0xFF; padded_bytes as usize]);
+    // buffer.extend_from_slice(&vec![0xFF; padded_bytes as usize]);
 
     flasher.write_bin_to_flash(
         args.address,